Luftwaffe Flak Troops "I.D." Disk

Disk is made of zinc and looks like it may have been in the ground and is about 2-3/4 inches long and about 2 inches wide. Marked on both half “STABSBATT. SCHW.FLAK ERS.A BT. 60.” Also marked 49 at top on both half’s. Overall shows heavy age and wear. Very Good + $60.00