Dr No[Moderator Omega - Wristscan]
37626
These third generation Seamaster chronometers without calendar function . . .
. . . are even scarcer than second generation models, of which one resides . . .

. . . in my collection. Curiously, there seem to be more first generation SM chronometers fitted with a cal 352 movement than either second generation with cal 505 or third generation with cal 551.
In my experience, third generation SM chronometers like yours are very few and far between, and definitely worth the attention of any vintage Ω collector.
Best,
Art
Not legit...
By: mac_omega : February 10th, 2013-23:13
Hi Thomas, sorry to tell you that this watch is not legit, it most likely is a marriage. Let me explain: cal. 551 was not used in Seamaster chronometers! This particular case ref. is of a GENEVE chronometer and the Cal. 551 is legit for this ref. But the ...
Hi!
By: tdn.dk : February 10th, 2013-23:47
Thanks, but in the Omega book under cal. 551 it claims to be used in both Constellation and Seamasters and i have fund identical watches by googleing. Google "seamaster chronometer" or the ref's and pictures of similar will apear. Best Thomas ...
Are you sure?
By: tferuh : July 1st, 2019-13:45
I can only make an educated guess and say that info you have given sounding so certain might not be correct. I recently came into possession of a Seamaster that has “Seamaster Chronometer Officially Certified” on the dial, “167.070 ref. #i inside the back...