Brt-26. Wt = 0.57-0.59g. Looks like a contemporary forgery

Photo from Oswal Auctions, sale 27, lot 235

 

Wt = 0.74g. Is this just a light-weight fanam?

Photo from Bob Johnston

 

Wt = 0.52g. Diam = ~7mm

Photo from Archie Maru

 

Wt = 0.48g

Photo from ANS 1973.56.1232