Three very similar finds in rapid succession. The first one is smoke with a clear edge and a flat ground but unpolished underside.
It has a signature in two parts. One scrawl looks like "Winterland" the other like "Bonbon" - or whatever you can make of it.
The height is 3,5 cms (1 1/4"). the diameter just over 6 (2 1/2") so tiny but wel made.
Familiar, anyone?