TYPE "C" DRUM SERIAL NUMBER 13, WITH ETCHED WINDING INSTRUCTIONS. ALSO NOTICE THE SERIAL NUMBER MARKINGS OF THE WINDING KEY.

 

CLOSE UP OF THE FRONT FACE PLATE ON S/N 13. NOTICE THE ETCHED INSTRUCTIONS OF "WIND TO 15 CLICKS".

 
CLOSE UP OF THE RIVETS THAT HAVE BEEN GROUND FLUSH TO ALLOW CLEARANCE.