In the early seventies, Yema recognized that their sports watches would also be appealing to many women who wanted a robust watch beside their conventional dress watch. Therefor they produced a couple of smaller watches with a diameter of 30mm and often an accurate derivative of the larger male models.   

The ad from 1971 on the left shows four of such ladies sport watches. It states:   'Developed for men and adjusted to your size. Real sports watches They were only available to men. This could not last. Yema has repaired this injustice.'

Montre plongee | Ref. 64.019 | Calibre FHF 36 hand winding | Diameter 30mm 

Montre Meangraf | Ref. 65.103 | Calibre FHF 362 hand winding | Diameter 30mm

The smaller sports models have a manual wound FHF 36 and FHF 362 (Date) movement. The Fabrique d'Horlogerie Fontainemelon (merged in 1925 with Landeron and in 1982 absorbed by ETA) introduced a low-priced mechanical movement which became the standard grade in 1955.  Notice the subdial @7 on these Yema watches. Not your average position for a sub second register.