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This one is circa late 1930’s, probably a unique piece. It is Cortebert cal. 661, 9 3/4 lignes (21.7mm). Unlike the skeleton small calibers widely used by PP, AP, VC and many other manufactures that are mostly based on the FP cal. 21 (which does not have a seconds hand), this one has a sub-seconds h

I think they were sold to dealers as sales tools. They vary in quality and they seem to go for a range of prices depending on quality or other factors

Circa early 1940’s, movement is a 9’’’ F. Piguet cal. 21 ebauche, signed Piaget & Co. Case is made by a specialty manufacture that supplied such cases to many of the brands that over the years sold this kind of novelty watch