Quizz : can you identify this 30mm caliber?

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Sorry I come late to the party.

I have nothing to add to the above interesting discussion. My contribution is a different observatory competition example – with a very similar movement number but this time a 47.7 (also known as a 21½). So the only relevance is the closeness of the numbers.


As we see, Tire-comedon’s number is 12780839. The number on my 47.7 is 12780814 (I think mine dates from 1951 - but I'm not sure).

My watch took part in the Geneva competitions in 1962, 1963 and 1964 (in the hands of Régleur Samuel Bodenmann). I have a summary of the 1963 event – which shows that S. Bodenmann presented five Omega 47.7 movements, in the category ‘Chronomètres de Bord’. The numbers were 12780808, -809, -810, -812, -814. I sadly have no idea how my watch was presented for competition – presumably in a mounting frame as we see with Tire-comedon’s 30mm (which allowed testing in different positions and temperatures) – and maybe it was later fitted into the silver case which now houses it: but I don’t know.

The Omega 30mm watches shown in the 1963 summary were in the category ‘Chronomètres Bracelet’ – and were presented by Régleur J.Ory.

The (various) movement numbers for 30mm watches used in competitions included 937-, 939-, 1082-, and as we see from Tire-comedon’s watch 1278- (and quite possibly others). As so often happened with Omega’s movement (and in earlier days case) numbers, the numbers were not always sequential and can be confusing when trying to date watches! Batches of numbers were allocated, often bearing no relationship to other watches with similar numbers.

The history of the observatory competitions, which took place over decades, especially for Omega-followers, is a story waiting to be told.
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