"Pura lana vergine" (pure virgin wool) is my guess
The official thrift/discount store bragging thread - Page 4360
Hrm, they had those little circles on the backside, but nothing visible written in them. Maybe nothing, or maybe the text was just worn down...
I have no button experience.
Gold is very malleable and reacts to the calcium in your teeth, so its best to go ahead and bite down on every gold button you see in a thrift store. Quite similar to the "lick" test for MOP buttons.
lol, the only things I would even remotely attempt to lick in a thrift stores are these puppies. Of course, that should be done with the owners' consent.
Warning: Spoiler! (Click to show)