Mog-4604. Wt = 20.66g. Diam = ~24mm
Photo from Zeno 30345, posted by Lingen

Wt = 21.04g. Diam = 22.4-23.0mm
Photo from Bob Johnston

Wt = 20.48g. Diam = 21.8-24.0mm
Photo from Bob Johnston

Wt = 20g. RY date at top of reverse
Photo from Abhishek Chatterjee on Facebook