Curved and Carved 1940s French Deep Blue 6cm Tall Belt Buckle

A 1940s French buckle - a deep midnight blue with interesting colour depths and variations characteristic of this type of vintage plastic.
There is a circular pattern carved  along one curved edge.

Just under 6cm tall, 4.5cm wide at the widest point.
The internal apertures are 4.5cm tall.

They come on their original French display cards