Identification Bumper Omega 343 18 KT

nebelderwelt · 2026-04-25T14:56:35-0500

Hello Omega Forum,
i recently bought this Omega after only a small consideration cause i like the look and now want to know more about it.
What i know so far is:

18 kt Caseback and 343 Caliber (the Seller opened the caseback before i bought it, but i didnt make any photos, and after reading https://omegaforums.net/threads/vintage-omega-posting-guide.383/ , i will go to a watchmaker in some time to get it opened again and can post photos then)
18 kt Case (Helvetia Stamp on the Side)

I looked through the https://www.omegawatches.com/vintage-watches for caliber 343 and found no matches.

There is lume on the dial, which also doesnt match any of the watches i found while browsing for a bit.

Greetings Tobias

Dan S · 2026-04-25T16:41:51-0500

Can't really be sure without more info, at the very least please post the diameter. Possibly a ref 2714 "Tresor."
https://www.omegawatches.com/en-us/watch-omega-tresor-omega-ot-2714

nebelderwelt · 2026-04-25T16:45:18-0500

Dan S
Can't really be sure without more info, at the very least please post the diameter. Possibly a ref 2714 "Tresor."
https://www.omegawatches.com/en-us/watch-omega-tresor-omega-ot-2714

diameter is 35mm

gatorcpa · 2026-04-25T20:35:34-0500

Dan S
Possibly a ref 2714 "Tresor."
https://www.omegawatches.com/en-us/watch-omega-tresor-omega-ot-2714

The Tresor has a non-chronometer movement, while the OP is claiming their watch has a cal. 343 chronometer movement.

We will need to wait until the watch is opened.
gatorcpa

TimeODanaos · 2026-04-26T09:33:54-0500

nebelderwelt
I looked through the https://www.omegawatches.com/vintage-watches for caliber 343 and found no matches.

Hello, Tobias, and welcome. I was a little surprised you found nothing - I selected for cal 343 and found four matches: see this link to their website.
Only about 5,000 of this movement were produced, so it is not that commonly seen. According to the Omega Museum as well as the corporate site, it is associated with the Centenary and the launch versions of the original Seamaster (whose very earliest examples did not have the sub-branding on the dial). Here is what you're looking for.

Cal 343 movement Annotation 2020-04-20 200029.webp

It will be interesting to hear what you find out - good luck.

smorrisonmd · 2026-04-26T10:33:31-0500

TimeODanaos
Hello, Tobias, and welcome. I was a little surprised you found nothing - I selcted for cal 343 and found four matches: see this link to their website. xxx
Only about 5,000 of this movement were produced, so it is not that commonly seen. According to the Omega Museum as well as the corporate site, it is associated with the Centenary and the launch versions of the original Seamaster (whose very earliest examples did not have the sub-branding on the dial. Here is what you're looking for.

It will be interesting to hear what you find out - good luck.

IIRC, the 2576 chronometre also uses the cal 343.

Identification Bumper Omega 343 18 KT

nebelderwelt

Dan S

nebelderwelt

gatorcpa

TimeODanaos

smorrisonmd

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