Mog-438.
Photo from Todywalla

Wt = 20.5g
Photo from Zeno posted by Lingen (from Amit Vyas)

Wt = 20.44g
Photo from Zeno posted by Lingen (from Vipul Nayak)

Wt = 20.39g. Diam = ~20mm
Photo from Zeno posted by Lingen

Wt = g
Photo from Zeno posted by Lingen