These are new military style metal nickel, silver finish buttons. This button has a loop shank back button and has a royal crest design on its surface.  The crest includes a crown and two lions in a square frame; button has a crisscross line pattern feel.

They come in lots of 3, 5, and 8. 

Sizes are 11/16" =17mm, 13/16" 20mm, 7/8" 22 mm.

Made in Italy.