Steel body. Steel shackle. “54” is stamped on obverse of the shackle. “1111” is stamped on the reverse of the shackle.”Doug Oestreich” is etched on the reverse of the body. Lock operation: You push the bit of the key in the eleven o’clock hole on the bottom brass plate to open the keyhole. The key will go in the keyhole but not all the way. You don’t need the key to open the lock. With your left thumb push the key post down and hold. Right thumb push the pin in on the bottom plate and hold. Take left thumb off keypost pin and rotate brass plate on left side of lock 1/4 turn counter clockwise. Let go of pin on bottom and push pin in on left side to open lock. To reset turn brass plate on left side clockwise till it stops and keypost pin will pop up. Close keyhole cover. November 2011. Only 1 of these locks were made.