WatchUSeek Watch Forums banner

2021 Speedmaster Chronoscope clasp compatibility with the 3861 Moonwatch bracelet?

59824 Views 240 Replies 66 Participants Last post by  tbensous
It’s 16 mm and adjustable. I like the fit of my 3861 Moonwatch bracelet, but wouldn’t mind having some on-the-fly adjustability. Has anyone looked into whether the chronoscope clasp will be available separately (I.e., without having to buy the entire bracelet)?
1 - 20 of 241 Posts
I’ve contacted Swatch about the clasp availability, and will update with their response.
  • Like
Reactions: 1
Please do. in the chronoscope thread, one of the other members said they ordered the clasp through their AD already.

I would guess that it will be available by itself at some point.

Look forward to your updates.
Reference: 117STZ013899

Confirmed by someone directly from Omega. Price is $212 plus shipping. I’ve already got one ordered, but since the watch was just released a couple of days ago there’s no guarantee on when it will actually ship. But it is currently available in the system for anyone with a parts account to order.

I do believe it’s 1mm wider, but from all of the pictures I’ve compared the connections look identical. We shall see!


Sent from my iPhone using Tapatalk
  • Like
Reactions: 5
Please do keep us posted... Although I may not need one, good to have the feature.
Available adjustment is 2.3 mm. Start @ 17:00
  • Like
Reactions: 2
I like the fast that the watch is totally a low-key travel watch in that not only can you use the chrono minute and hour subdial as a second time zone (one that can also show time zones that differ in 15min increments), but the watch also has a quick-set hour hand.

Back to the clasp topic, the above video confirms that the Speedy Pro will eventually get an adjustable clasp as well. The question remains will that clasp have the same width as the current Speedy Pro clasp at 15mm, or if it will be the exact same clasp as on the Chronosope, which is apparently 16mm.
  • Like
Reactions: 1
2.3mm though? I’m interested but hoping for 5mm or better total some day with a few stops in between.
  • Like
Reactions: 2
The new bracelet is so slinky and has such small links, my opinion is 2.3mm will work.

The SM300MC and 300m have the multi position microadjust clasp. They are heavier watch heads and the bracelet links are larger.

The more microadjust the better though.
Good lord, edited….one too many Martinis tonight.
  • Like
Reactions: 1
The new bracelet is so slinky and has such small links, my opinion is 2.3mm will work.

The SM300MC and 300m have the multi position microadjust clasp. They are heavier watch heads and the bracelet links are larger.

The more microadjust the better though.
Maybe. I’ll see what others say about it before dropping the cash myself 😂

I put a microadjust on an SMPC I had years ago and it was the best $110 or so ever spent. Wore a PO 8900 for 3.5 years exclusively and loved the micro adjust. Wearing a 3861 Speedy now and I’m all for spending the $$$ on adjustability but just feeling like it might not be enough. Sometimes I feel like 5mm on Rolex ez link isn’t enough, but perhaps I’m wearing them tighter knowing I can adjust.
How this wasn't included with the 3861 from the start is beyond me.
  • Like
Reactions: 4
Hi everyone. I received an update from Omega (specifically the Swatch spare parts department in NJ) this morning:

"The part number for the [chronoscope] clasp is O117STZ013899, this is on backorder 4-6 weeks after the order is placed and retails for $211.00 plus $10.00 ground shipping and applicable sales tax. Please be advised that clasps are not interchangeable between bracelets."

So this confirms the part number and price Iowa_Watchman mentioned above. What remains unclear is exactly what "not interchangeable" means. What we really need to know is whether the Chronoscope clasp can be physically and securely attached to the 3861 Moonwatch bracelet, albeit with a bit of side-to-side overhang due to the 1mm difference in width, and what that will look like.
  • Like
Reactions: 1
I don't think the Chronoscope is all that popular.... this is all an elaborate scheme to sell clasps!!
  • Like
Reactions: 5
Hi everyone. I received an update from Omega (specifically the Swatch spare parts department in NJ) this morning:

"The part number for the [chronoscope] clasp is O117STZ013899, this is on backorder 4-6 weeks after the order is placed and retails for $211.00 plus $10.00 ground shipping and applicable sales tax. Please be advised that clasps are not interchangeable between bracelets."

So this confirms the part number and price Iowa_Watchman mentioned above. What remains unclear is exactly what "not interchangeable" means. What we really need to know is whether the Chronoscope clasp can be physically and securely attached to the 3861 Moonwatch bracelet, albeit with a bit of side-to-side overhang due to the 1mm difference in width, and what that will look like.
Correct and I’ve already got one on order, so happy to be everyone’s guinea pig!


Sent from my iPhone using Tapatalk
  • Like
Reactions: 3
9
I have good news galore. I got the call yesterday that the clasp I ordered was ready to be picked up. I dropped by earyl this morning with my Speedy Pro and handed it over to the OB's watchmaker. Unfortunately I was seated away from him, so I didn't see exactly what he did, which will become more important later.

The good news is that it fits the 3861 bracelet, the great news is that it is a perfect fit in terms of width compared to the bracelet! And the fact that the price was only CHF 200 was just the cherry on top. Even the SA was surprised seeing that apparently a simple pin buckle from a different model already cost CHF 250.

Anyways, there was a couple strange things which made me regret that I didn't see what the watchmaker was doing. First off, as you can see from the pictures below, the Chronoscope clasp (in all pictures the one attached to the bracelet) is slightly longer than the original clasp. When I came in, my 3861 wore slightly loose on my wrist. After the clasp was switched, with the new clasp not set to the extended setting, the watch fit tighter than it did on the old clasp. Yet the watchmaker assured me that he did not remove any links.

Another weird thing is that as you can see on the receipt at the bottom, there are two serial numbers for two parts. And the SA confirmed that there was indeed the clasp and an "attachment piece". As the watchmaker was gone at that point, I wasn't able to get a clear picture on what part the attachment piece was exactly. Also, for some reason the SA told me that they were not able to give me the plastic baggies that held the original parts. As you may know, these show the serial numbers on them. I've purchased parts from them before, and it's the first time they withheld the bags.

Anyways, the watch now fits me better than before, and I am glad to have a quick extension for those hot days when my wrist swells later in the day. I was also able to handle the Chronoscope and the Seamaster 300 while I waited, and both are great looking watches!

Wood Auto part Watch Metal Analog watch


Watch Analog watch Wood Rectangle Watch accessory


Watch Hand Wood Watch accessory Clock


Watch Clock Watch accessory Nickel Jewellery


Material property Belt Metal Personal protective equipment Auto part


Hood Wood Belt Bumper Automotive exterior


Hood Wood Bumper Automotive exterior Gas


Watch Natural material Finger Rectangle Watch accessory


Rectangle Parallel Font Paper Number
See less See more
  • Like
Reactions: 5
That looks great!

So now when they bracelet is extended, is the smaller connection area still covered by the top of the clasp?
  • Like
Reactions: 1
I have good news galore. I got the call yesterday that the clasp I ordered was ready to be picked up. I dropped by earyl this morning with my Speedy Pro and handed it over to the OB's watchmaker. Unfortunately I was seated away from him, so I didn't see exactly what he did, which will become more important later.

The good news is that it fits the 3861 bracelet, the great news is that it is a perfect fit in terms of width compared to the bracelet! And the fact that the price was only CHF 200 was just the cherry on top. Even the SA was surprised seeing that apparently a simple pin buckle from a different model already cost CHF 250.

Anyways, there was a couple strange things which made me regret that I didn't see what the watchmaker was doing. First off, as you can see from the pictures below, the Chronoscope clasp (in all pictures the one attached to the bracelet) is slightly longer than the original clasp. When I came in, my 3861 wore slightly loose on my wrist. After the clasp was switched, with the new clasp not set to the extended setting, the watch fit tighter than it did on the old clasp. Yet the watchmaker assured me that he did not remove any links.

Another weird thing is that as you can see on the receipt at the bottom, there are two serial numbers for two parts. And the SA confirmed that there was indeed the clasp and an "attachment piece". As the watchmaker was gone at that point, I wasn't able to get a clear picture on what part the attachment piece was exactly. Also, for some reason the SA told me that they were not able to give me the plastic baggies that held the original parts. As you may know, these show the serial numbers on them. I've purchased parts from them before, and it's the first time they withheld the bags.

Anyways, the watch now fits me better than before, and I am glad to have a quick extension for those hot days when my wrist swells later in the day. I was also able to handle the Chronoscope and the Seamaster 300 while I waited, and both are great looking watches!

View attachment 16154445

View attachment 16154446

View attachment 16154447

View attachment 16154449

View attachment 16154452

View attachment 16154454

View attachment 16154456

View attachment 16154457

View attachment 16154460
Dang, thank you for the great reply and all of the pictures! I have to admit, I’m a little sad I couldn’t be the first to complete this haha. I’m guessing the attachment piece is probably just spring bars or screw bars, right?

I’m actually happy to hear the clasp itself is a little longer (figured it probably was). That should give me a perfect fit with the option of extending if needed. Thanks again!


Sent from my iPhone using Tapatalk
  • Like
Reactions: 2
1 - 20 of 241 Posts
Top