Lecoultre Mystery Calendar

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Cal 810/AW

30.4-mm

14K

Push-button in the crown quick-sets the date.

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The serial no is approx 1952 & there are pics of them on p.57&58 of Zaf Basha's book. He says they are cal. 810, in production 1952-4 with a production run of 9,500 movements. He says there are a "variety of dials and cases" on them, but date lettering is usually blue.

This one looks like a US model.
 
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Nice little watch you have there.

Nice it is. I assume small watches around the 30mm diameter mark were very popular in the 40-50s.