Brt-1776e. The shape of the ball suggests this one might be the 1215 type

Stevens Collection

 

Wt = 11.19g

Photo from Zubayr Khan

 

 

 

Wt = 11.17g

Photo from Zubayr Khan

 

Wt = 11.18g

Photo from Zubayr Khan

 

 

 

Wt = 11.17g

Stevens Collection

 

Wt = 11.20g

Stevens Collection

 

Wt = 11.16g. Diam = 20.8-22.0mm

Photo from Bob Johnston