An exact copy of a M123-125 bomb tail fuse vane (propeller), standard in WW2 GP bombs.

Apparently there are real fuses available but without the vane (propeller) These replicas are redesigned to fit the M123-125 style tail fuses.

These tail fuses designated use is for AN-M bombs 100 lb - 4000 lb GP bombs.

••Bomb Tail Fuze Fun Facts••
Principle of Operation: During bomb’s release from the aircraft, the propeller (vane) rotates, allowing an impeller to spin. After a certain number of revolutions, the fuse becomes armed, allowing it to function. When the bomb impacts the target, the firing pin punches the detonator causing it to detonate, activating the booster charge, which causes the main charge to function. These bombs are equipped with nose and tail fuses. The common nose fuse is the AN-M103 and the tail fuse is the AN-M123-125.

Tail fuse for 100 lb and 250 lb is 6.3" long
Tail fuse for 500 lb is 9.3" long
Tail Fuse for 1000 and 2000 lb is 13.3"