I have found this very nice Art Deco "modernist era" wristwatch. Antiquorum used to describe it as “Blue Sapphire” Vacheron & Constantin, Genève, Ref. 296. Made in the 1930ies. Very fine and rare, pink gold, Art Deco gentleman’s wristwatch with sapphire-set dial and hooded lugs.
Yes, it was a man's wistwatch of 30 mm diameter: today a woman would probably be more enclined to wear it.
I guess, I will have to offer it to my girl.