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This is the front body part of a 1/20th scale USN Mk13-1 torpedo as used on PT Boats on "roll off racks" and air dropped from planes in WW2. This fits together with "MK13-1 Torpedo Tail 1/20th scale" and can have a printed circuit board inserted into slots to make a fully operational scale torpedo. Note that no propellers are included, this is just the front body. see www.pt-boat.com for further details.