Sigma Valmon Curvex 18k Pink Gold ref.333 from 1940s

The FEF 130 movement was developed by Fabrique d'Ébauches de Fleurier (FEF) and produced from 1933 until 1963. Its production ceased after three decades, as round wristwatches became more prevalent in the market.  It features a sub-second function and is characterized by its compact dimensions, measuring 7¾ x 11½ lignes (approximately 17.5 x 26 mm) with a height of 3.3 mm.

Maker: Sigma Valmon 
Model: Curvex 
Reference: 333
Year: 1940s
Case No: 156479
Material: 18k Pink Gold
Dimensions: 20x33mm
Crystal: Mineral glass 
Lume: None
Caliber: Fabrique d'Ébauches de Fleurier cal.130
Bracelet/Strap: Purple/Gray Lizard strap
Lug Width: 15mm 
Box/Papers: N/A