cal. 1120

Proven workhorse

 

This!

it's a bog standard 2892A2 with decoration. The 2892 being a thinner and slightly improved for reliability 2824.

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I’ve had my 1861 Speedy for 11 years and it’s been perfect, I probably should get it serviced though.

Seamaster 300 with 8912 movement since 2021 and has been running great with no issues.

I’ve had 2 PO’s with 8900 movement over the past few years and both of those have been excellent.

I’ve also had 2 Seamaster 300m with the 8800 movement, one of them had an issue where the movement stopped however the other one was great.

Not sure if that helps you but that’s been my experience.


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Great choices above..i really like the 1002..and the 1120..

 

10 year old 1861 here, never serviced, one of my two primary watches. still running flawlessly without service -4 per day.

 

I’ve had my 2500-D SMP for almost 7 years and it has been very reliable. It was my daily for the first 4 1/2 years and still gets worn 1-2 times a week.

Has not yet been serviced and is performing within COSC specs.

 

In my experience Caliber 1861 has proven most reliable.

My Caliber 2500 watche needed to be serviced for rate result problems that I think stemmed from known hairspring issues (I think it was 2500B with a known issue addressed in later versions).

My Caliber 8500 model had the head of one of the balance bridge screws shear off and jam the rotor (!). After Omega repaired that there were problems with the jumping hour hand and also with the crown/stem.

 

My 8900 PO is reliable and is the most accurate watch I own. Love it.

 

d) All of the above

All the kinks have been worked out

 

I love hearing about 1861s with 10 years since last service. It’s the one aspect of my 2020 1863 Speedy I’m not looking forward to (getting it serviced) but it sounds like it could be still some years off.

 

I haven't heard of any problems with the 8800 since it was introduced.

The 2500 had problems in the beginning, but no more than expected for a new and innovative design. By the time they got to rev C those problems were pretty much resolved.

 

My 2500 D and 8800/8900 have been rock solid.

 

I don’t know what the caliber is but I wore this 17 straight years with no service and excellent time keeping. This should be considered highly reliable. I purchased in 1999

 

Out of curiosity, once you got it serviced, did it require any work/parts over and above what you would expect a watch to require after say a 10 year service interval?

 

The 5xx series was and likely always will be the best.

 

True! The 551/561 are legendary.

 

issues with the 2500? the 2500C i think is fine...maybe the earlier ones had issues. my seamaster Planet ocean has the 2500C movement. No issues whatsoever in the almost 15 years of ownership.

 

What I could say that = ten years = 8500 starts to run at almost a minute per day with Si14, while local service said it runs around 1 sec per day, so that's why I sent to full service. No problem with 4r36 and it runs in two times more precise than 8500.
I realise clearly, that 3861 won't be as good as 861/1861, because it's 'loaded' with co-axial, more details.

8900 is almost the same as 85, I am not sure whether they changed it dramatically in terms of details - problem with quick hour hand! Archer is an expert, I think he could advise better here..

 

8500 starts to run at almost a minute per day with Si14, while local service said it runs around 1 sec per day

That sounds like magnetization to me. Easy fix if so.

 

I love the 1120. Thin and reliable and any competent watchmaker can service it.

 

My own experience

2500 PO - lots of issues - sold due to them
8900 PO - approx 3 years no issues
Calibre: OMEGA 3301 - owned approx 1 year - no issues. Used watch

 

Just to point out that Silicon is not a magnetic material, so a magnetised silicon balance spring isn't possible

I've got a 10+yo PO chrono with a 9300 in it that is near-perfect at around +1 sec per day and has been for that entire time.

The 1861 in the Speedy Pro is about 8 yo now and runs from -4 to +6 per day

I'm pretty happy with that

 

ChatGPT says:

Omega is a well-known Swiss watch manufacturer that has produced a number of high-quality and reliable movements over the years. Some of the most highly regarded Omega movements in terms of reliability include:

1. Omega Calibre 8800/8801: This is a co-axial movement that is known for its accuracy and durability. It is used in several Omega watch models, including the Seamaster and the Speedmaster.
2. Omega Calibre 2500: This is a durable and reliable quartz movement that is used in a number of Omega's sports and dive watches.
3. Omega Calibre 1861: This is a manually-wound mechanical movement that is based on the legendary Lemania 1873 and was used in the Omega Speedmaster Professional "Moonwatch."
4. Omega Calibre 9300/9301: This is an in-house chronograph movement that is known for its performance and reliability.

It's worth noting that the reliability of any movement depends on a number of factors, including the manufacturing quality, usage conditions, and maintenance of the watch. So while these movements are generally considered to be reliable, individual experiences may vary.

 

1020 Lemania based movement from 1973 no issues but has been serviced.

8800 4 years, no issues.

 

Only owned the 8900. The time keeping is fine (+2-3 seconds per day).

However, the independently adjustable hour hand is misaligned. I can’t remember if this was out of the box like that or broke during my use (watch acquired in Dec 2020). It’s now only fully aligned with the hour index about 12 past.

It irritates me but I will wait before I send it in for service and lose it for 3-6 months.

 

I have owned an AT 8500 since Feb of 2016. Blue dial and 41.5 case. I had it serviced at an OB at the 5 year mark and will continue to have it serviced every 5 years. It did take about six weeks to get it back from servicing. I wash it about every three months with a soft toothbrush and bar soap. When serviced they replaced the hands, gaskets and a couple of parts I am not familiar with. I have had no issues with this watch and have worn it continuously since purchase.