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Ref 2923 pre Carerra Dato

Dear OTD members,
I m searching information about the early waterproof 38mm screw back pre Carerra Dato with Valjoux 72C
Are there copies of old advertisements existing?
Which range of date they were produced?
Does anybody of you know about the quantities produced and the watches that appeared or are in collections?
How about dial variations?
In which range of serial numbers this watches are.
I would really appreciate very much if you would share some information.
Thanks in advance!

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