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Very nice set my friend!

 

There's a sixth reference, ref. 3501, which uses the larger cal. 375 automatic movement.  The cal. 375 is 28 mm Ø while the cals. 3752, 37521, and 3755AM used in the refs. 3509, 3529, and 3519, respectively are all 25.6 mm Ø.  The 3509 and 3529 eventually replaced the 3501.

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