Mog-839. Wt = 4.33g
Photo from Steve Album

Wt = 4.03g
Photo from Bhandare who wrote: slightly lower weight perhaps due to some clipping at the edges

Photo from Zeno posted by capricorn

Wt = 4.69g. Diam = ~25.5mm
Photo from Zeno posted by Lingen

Photo from Zeno posted by naeem

Photo from Zeno posted by naeem