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Discussion Starter #1
Please pardon my ignorance but isn't the 7c46 just another quartz movement? Please educate me!
 

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I'm not an expert on it, but my brief understanding is that it is extremely reliable and very, very ruggedly built using all metal components. It is likely thermal insulated as well, all designed to handle the extremes of deep saturation diving.

Others will know more tho...

Best,

Mike
 

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Hi Romeo1...The 7C46 is much more than just another quartz movement

As "Speedbird" has correctly mentioned, these movements are quality built movements.


So lets dive alittle deeper into just what this 7C46 quartz movement is, and what features it possesses ...

First of all,
The term "Prospex" translated into English terms means (Professional Specifications), and the 7C46 quartz machine is only found and used in the SEIKO Professional Series Quartz Dive watches, namely the Tuna series and the prior Professional Ashtray models.

They the 7C46 movement & the Tuna series cases, were built with a specific purpose and intent in there specifications and ultimate design; and that was to be the best professional tool divers watch made! (So nothing was spared or held back in there design or quality of manufacture)

As we know, "Seiko" actually is the original father of this realized quartz watch technology that actually came out of the real world commercial diving industry as a answer to having a divers watch that could handle the rigors of deep depth.
Thus, they were designed with no cuts in quality or cost saving materials at all; but rather have advanced scientifically developed components and material in there make up.

The 7C46 is a (Hi-Tech) multi jeweled movement with extreamly "Hi-Torque tollerances and High efficiency" built in over prior 7 series quartz movements, which enable the 7-jeweled geartrain and pinions to motion & turn the hands in perfect sync to the energy-pulse, with much less kinetic effort via the electronic step motors that power them.
Thus making for a highly accurate and efficient full size quartz machine to perform strongly with much less resistence.



They also incorporate (dual-rate trimmers) which allow the watch to be perfectly synchronized for extream accuracy, which aid in the longevity and add to there lifespan, while running well with in the stated accuracy specs.

They also enjoy the added benifits of, Low-Drain electronics while providing High-Torque Power to the gear driven train and Oversized Hands for optimal efficiency & extended battery life. As an added plus, this caliber also incorporates the E.O.L. (End Of Life) Low battery warning feature, of the seconds hand ticking at 2 second intervals when the battery voltage is low, thus alerting the owner its time to replace the battery cell.

They also provide the Premium Benefits of being designed in a full expanded size, and are incorprated into the advanced Titanium alloy cases that house them, which are also very highly advanced designs on there own rite built with advanced shock protection built-in specifically for this movement.

The cases also provide "Enhanced antimagnetic Gauss's law & thermal compensational technology, as well as full Helium/Nitrogen gas Prevention & Dispersional technology.

They simply are just the perfect combination of the utmost in quality craftsmanship, to enable them to easily handle the various extream conditions of Commercial diving found around the globe, in any oceanic environment.

They also can be completely diassembled for cleaning & service many years down the road; that together with the other quality design features therefore make this movement, the absolute highest quality advanced Professional quartz divers watch movement in the world AFAIC.

These highly evolved movements, as well as the Tuna series Professional Dive watch cases & components, probably hold more advanced (patent designs) than any other watch in the world!


Well I gave my thoughts and some facts about these movements, and I hope it helps you to understand just how much quality & technology goes into the 7C46 movement...

Cheers, ;-)
Jimmy
 

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Discussion Starter #4
Great! Thanks for the informative answers guys! I feel really good about my new SBBN015! :-!
 

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Great post Jim, I enjoyed the read thoroughly. Love the tuna's, nice to know why I love them so much and more so now. ;)

Cheers, Dave.
 

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Thanks Dave, it's actually a great honor that the Tuna family

houses such a quality specialized movement such as the 7C46!

I agree that it makes owning the Tuna that much more interesting and special to it's owner, considering both are only found with-in each other, in what I and many others like you feel is the absolute highest quality Professional working tool Diver available IMHO. :p

Thanks Dave & Dive watches Rule! ;-)

Jimmy










Great post Jim, I enjoyed the read thoroughly. Love the tuna's, nice to know why I love them so much and more so now. ;)

Cheers, Dave.
 

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Re: Hi Romeo1...The 7C46 is much more than just another quartz movement

Geez Jimmy - where do you get this stuff? You're a legend mate!
 
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lol, well thanks Jason_recliner!...When it comes to Tuna, I get very hungry

and it's just that I really get into these watches and the movements that power them.

I appreciate the thoughts mate, and you guys are just a great group of forumers that I've been fortunate enough to be associated with, so many thanks!

Regards & hope the summer comes soon in your neck of the woods- ;-)

Jimmy



Geez Jimmy - where do you get this stuff? You're a legend mate!
 

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Re: lol, well thanks Jason_recliner!...When it comes to Tuna, I get very hungry

Just look at how well these 7C46 movements will hold time within specifications ,even after decades of usage...that's the proof it aint just any quartz..

some of my old seiko ordinary movement quartz have long kaput...but the tunas(7C46) remains solid and sharp on time.
 

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I totally agree GlennSim, they are as accurate as any watch going IMO

My SBDS018 1000m Golden SQ Tuna, and my other SSBS018 Golden Tuna kept as good time as less than -1 to -1.25 seconds in 90 days if my checks were correct...I'm sure they both may have gained & lost fractional time but then self adjusted and were well with in cosec or better yet, atomic clock time.
Granted, they were both fairly NOS but the batteries were on 4 years of age and still kept exacting accuracy & time.
(I think the consistency of -1 to -1.25 shows the movement was right on the money, and probably only needed a tweak on the rate trimmers to the positive gain just a click or so)

I'm sure (Romeo1) now has enough info, to form a very good take on these 7C46 movements now, and that they will stand the test of time!

Regards, ;-)
Jim





Just look at how well these 7C46 movements will hold time within specifications ,even after decades of usage...that's the proof it aint just any quartz..

some of my old seiko ordinary movement quartz have long kaput...but the tunas(7C46) remains solid and sharp on time.
 

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Re: Thanks Dave, it's actually a great honor that the Tuna family

Hey Jimmy,

You should write press releases for Seiko :-!

In a good way i meant. Cheers!

houses such a quality specialized movement such as the 7C46!

I agree that it makes owning the Tuna that much more interesting and special to it's owner, considering both are only found with-in each other, in what I and many others like you feel is the absolute highest quality Professional working tool Diver available IMHO. :p

Thanks Dave & Dive watches Rule! ;-)

Jimmy
 

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Hi Richard, well yes I have many good thoughts about the 7548 quartz divers

I know you probably havent seen me write about them too much, but I have mentioned them and what universal applications they actually have many times here and on the old SCWF.

It's true that these movements are in the same family unit as siblings one to another, the older vintage movements have been upgraded and the specs have increased over the years for each successive caliber sibling, but you would be hard pressed to find a more reliable and trustworthy unit than the 7548 quartz movement outside of the family.

As far as nationality goes, the family unit is number 1 in many countries DNA lines of heritage as it should be; and the Japanese SEIKO brand takes no back seat to having a rock solid family unit...;-)

The 7548 quartz movement caliber is one of the finest & longest lasting workhorse movements in the world, they have been around the scene and have been worn daily by there owners for a good 30 years or so and many are still running as strong as the day they were made.
These movements can go a good 20 years or longer in some cases with no service ever being done to them, and when they are serviced and taken care of properly, it's not unreasonable to feel that they could possibly last a couple lifetimes.

Although they do have increased tolerence and torque specs compared to there older cousins and have proven to be one of the best longest lasting quartz machines ever produced, they are not equal to there big brother 7C46 in technology specs and upgraded features, but there also not too far behind either.
The 7548 is an unadusted 5 jewel quartz machine powered by the same type of step motor and technology as it's new big brother has, but lacks some of the finer tech upgrades of the 7C46 such as the addition of rate trimmers and has alittle less torque but sifficiant torque as compared to previous vintage quartz calibers.


The best feature & attributes of the 7548 besides being one very fine quality designed long lasting robust quartz movement, is that it also is about one of the most versitle and swappable movements ever made.
Yes, these 7548 quartz movements will fit into nore than a few vintage divers such as the 6105-8XXX or the 6306 & 6309 divers cases, they drop right in and run perfectly with in those various cases.

The 7548 diver can be totally swapped and almost all parts of it can be used on the 6309 diver family & vice versa. Movement, dial, crystal, bezel, caseback, crown & stem all drop right into either or case perfectly.

Well I could say more, but hey I think I gave you enough info to draw a conclision that the 7548 is one of the best all time favorite seiko movements and watches ever made.

You couldn't go wrong with picking up a nice 7548, they are that popular for obvious reasons I stated & more as others could add to the list I'm sure. The parts for repair if needed are plentiful indeed, and servicing is very straight forward and fairly easy I believe.


Thanks Richard, :-!
Jim





Jimmy,

any thoughts on the 7548, the sibling of the 7c46?
I'm thinking on picking one up for restoration.
 

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Well Jim,

You almost made me cry as you spoke lovingly about the 7548 :-!
I just made payment to another WUS member so I will be expecting it in the next two weeks or so.

Next, the hunt for the red october, ehhh, stike that. Hunt for a 7c46.


thanks sofar.
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Re: Hi Richard, well yes I have many good thoughts about the 7548 quartz divers

Excellent topic Jimmy! :-!

I like my 7548 a lot!




I wish I could pull off the 7C46 Tuna, but they are too big for my wrist lol.

However, I can enjoy my 7C43 instead lol..... BTW, what is the metal ring between the crystal and the chapter ring Jimmy?




Anyway, very educational thread. Thanks again Jimmy! :-!

- Hiro
 
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