Super lot with 4 different antique "twinkle" buttons that have brass over tin mirror backing.  All 4 of these buttons have tin metal backs with hump shanks.   One is a fabulous marquise shape measuring 7/8" long.   There is one of the round ones that is 7/8" marked "TCHECOSLOVAQUIE" on the back.   The other 2 round buttons unmarked, and although lovely on top, these 2 have some rust on back.