MCE-18719. Wt = 10.96g. Diam = ~21mm
Stevens Collection

Wt = 10.95g. Diam = ~21mm. Could be RY32
Stevens Collection

Photo from Zeno 94376, posted by Keesuit

Wt = 11g. Diam = ~21mm
Photo from Zeno 280157, posted by rati