French military button collection

Acquired quite a collection of French half domed military buttons both gold and silver coloured. Assume the gold is brass - not sure what the silver coloured ones are made of - perhaps pewter?

There are two main sizes - marked on the reverse - most 2cm in diameter (or just under - marked 21) - or smaller 1.5 cms. Variety of maker marks on the reverse including T.W & W Paris / S.B.C Grenoble.

Motif designs are anchor or star - the former one shown is used but I have more unused. The star ones are all unused.

I also have:

gold buttons marked Etrangere Legion by T W & W Paris - all unused
gold buttons with anchor motif, no reverse maker mark and much flatter (these are used).

Any thoughts as to dates, material or provenance received with many thanks.