As far as I remember, I haven’t blogged about the Omega calibre 3303 yet… which is a shame. This Seamaster has one inside, and it’s well worth having a look!
The dial design already lets us know that there is no 7750 inside, but something different.
The case will need a good clean as well…
Performance is pretty abysmal, as it’s been quite a while since the last service.
A first look. This doesn’t look like an Omega movement, and it doesn’t look like an ETA, either. And there is a good reason for that. The 3303 series was designed by F. Piguet, now called Manufacture Blancpain, owned by the Swatch Group. So strictly speaking an in-house (or rather in-group) movement.
The execution reminds me more of a Rolex movement than anything coming from ETA, and that’s a good sign. Piguet makes very nice movements indeed, and this is no exception.
Lovely decoration, lovely design.
The autowinder is unidirectional, and it could have been made bi-directional without a lot of sweat, but I don’t want to be too critical. It works well, and that’s what counts.
Somebody has inflicted some damage on the chronograph bridge.
With the chronograph bridge removed, you can see the vertical clutch of the chronograph second runner.
This photo shows the working of the vertical clutch. The two arms come in from the left and the right to separate the clutch.
The vertical clutch with the clutch arms removed. On the left, the heart-shaped cam of the hour recorder.
With the wheel bridge removed, we can see the full gear train.The movement also has a hacking lever to stop the movement when the crown is pulled out.
Now it’s time for the bottom plate. The movement has a quick-set date.
Date wheel and quick set wheel visible.
All clean and ready for reassembly.
The balance jewels go in first.
As usual, I want the base movement to work before proceeding.
The only bugbear I have with this movement is the start/stop lever for the chronograph (right of the column wheel). It’s a bit puny, and would deserve an articulated lever and a spring.
Ready for the chronograph bridge.
The pallet fork is in place, and I can now put the balance in – the moment of truth!
The keyless works go in so that I can wind the movement.
And the balance is ticking. Let’s see how it’s doing…
Just put back together, the amplitude will improve. The movement is slightly slow.
Sorry for the bad photo quality, but this is after adjusting the two screws on the balance to set the beat rate.
The bottom plate is ready for its plate.
Pretty thin for an automatic chronograph movement.
And the movement is cased again.
Back in business!
I really like this movement. It’s got everything you want from a chrono (automatic, date, hacking lever, minute and hour recorder), it’s fairly small, and it doesn’t eat itself up like the Zenith El Primero, which would be the direct competition for this movement.
Beautifully constructed, a good performer, and a good looking movement. Now let’s put this in a smaller case, and I’ll buy one 😉
Hello Watch Guy!
Wow, thank you so much for a comprehensive breakdown.
I too am working on a 3303 as we speak (slow going of course).
Any idea as to the hand/hole/post sizes on this caliber? I am attempting to find replacement hands with no luck.
You have the watch in front of you – just measure?
At the moment I don’t, unfortunately. I have a friending helping me with the cleaning of the components as I don’t have a machine myself.
Also, I have a set of calipers but not sure if they can measure that small or that precisely.
Hello, I just bought one of these watches recently, and I found it is delaying like 1-2 minutes per week. Is this normal?
Thanks and congratulations on your post.
Should be below a minute a week.
Hi Christian,
Fascinating work! So meticulous and precise!
I recently bought this exact Seamaster Chronograph Americas Cup model! Beautiful watch!
I sent it for a full service with Omega and just got it back. The watch is running perfect, but I noticed that if I don’t wind it manually every 2-3 days, it stops, regardless of me wearing it every day. I give it a shake and it comes back to life for a few minutes.
Apparently, the auto winding mechanism is working, but I don’t hear the rotor anymore (used to prior to sending the watch in).
My question for you, who clearly knows a lot about this movement, is whether my daily office routine (most of the time sitting at my desk) should be enough to keep the watch going or is it normal to have to wind it every 2-3 days?
Return it to Omega. Anyone who isn’t close to dying will move enough to keep an automatic watch going.
Thanks for your advice. I should probably return it while the warranty still on.
best
I just got a Speed-master 42 Olympic edition with this 3033 movement – very happy to see your work and comments.
Thanks!
Marcos
Seattle, WA
Lovely watch – date window very discrete.
It’s been a while since there are new posts..
Too many watches in the workshop 😉
Fascinating to watch…like a surgeon at work. By the way, I recently purchased my first Speedmaster Professional and couldn’t be happier. I’m having a hard time trying to figure out the production date though. Watch is a 145.0022/345.0022, bracelet 1171/633, and serial begins with 3558. According to charts I’ve found online the watch was produced either 1972 or 1977. Do you know how I can verity the actual production date? Thank you!
Omega used to have a service on their web page where you could match serial numbers with their database. Not perfect to the month but to the year at least. Hope it helps!
How does stainless steel rust like that? Did the owner left the case in a bath of salt or something?
Sweat.
This is my watch. Having stopped wearing this watch running marathons after Christian service and blog, and having just fitted a NATO strap, I can confirm there is no longer any rust forming.
Christian – watch still running smoothly after 3.5 years! Thanks.
Thanks for the feedback!
Bravo! What a wonderful walkthrough on the 3303. I agree with you that the stop lever is irksome and could be designed better.
Hi Christian!
Is that rotor damage on the chrono bridge do you think?
Excellent post as always 🙂
Best regards, Ben
Yes, looks like the rotor was loose at one point.
Nice movement and great work as always.
But I’m with you Christian – a slightly smaller case would be nice
Thank you very much for the walkthrough, was a pleasure to read.
Keep up with your postings.
Lieben Gruß aus Köln
The date window is very well camouflaged in your final photo – took me a while to find it!
Yes,at 6th of every month this watch gets it’s full harmony)))
Ah yes, I didn’t think there was one until you pointed that out. Very nice watch too.
Wonderful walkthrough as usual, thanks for sharing. The 3303 is an interesting movement I’ve not seen before and is nicely finished by the manufacturer too.
Am I correct in thinking the hour recording mechanism is located on the same side as the rest of the chronograph works?
Yes, hour and minute recorder are at 90 degrees to each other, and both on the top plate.