Opinions on my Chrono cal.320

Artu58 · Jan 30, 2026

Hi, what do you think of my Omega cal.320 Ref. OT 2872 in 18kt rose gold?
The movement serial number would place it around 1958/59. Is there a way to date the case serial number as well?

amuscare87 · Jan 30, 2026

Artu58
Hi, what do you think of my Omega cal.320 Ref. OT 2872 in 18kt rose gold?
The movement serial number would place it around 1958/59. Is there a way to date the case serial number as well?

Absolute class!

Peemacgee · Jan 30, 2026

Nice, there are a couple amongst the members here.
I’m afraid I don’t know how to decipher the case serial number.

JimInOz · Jan 30, 2026

Artu58
Is there a way to date the case serial number as well?

My case number reference ends at 10 million (1943), but with an approximate extrapolation, your 11.5m would put the case at about the same era as the movement.

Your case was made for Omega by Jung & Cie, La Chaux-de-Fonds, Switzerland.

Dan S · Jan 30, 2026

Interesting to see such a large case serial number, the standard table I've seen doesn't reference anything larger than 10M.

johnyboy · Jan 31, 2026

Dan S
Interesting to see such a large case serial number, the standard table I've seen doesn't reference anything larger than 10M.

Mine is a 2451, so maybe different, but has a 11.2M case number, and 13M movement. I’ve always assumed is was ~1952/53 but maybe it’s a bit later?

Opinions on my Chrono cal.320

Artu58

amuscare87

Peemacgee

JimInOz

Dan S

johnyboy

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