They are glass buttons the colour of shiny pewter.
The detail in the design is amazing.
They look a bit like faux marquasite.
I have consulted my trust little "button bible" ...
It seems that they were produced between 1940 and 1960. They are in really good nick so I am guessing 1960ish - before I was born at any rate! Now that you have seen my little treasures why not pop over to Sophie's and see what everyone else has been collecting this week.