Abstract: A holder (10) for stamps (20) used to imprint identifying characters into the surface of a material which can be magnetized. The holder includes a frame (12) having a channel (18) formed therein to receive the stamps, which are held in place therein by means of a rod (28) which is received through holes (34, 36) formed in end plates (30, 32) attached to the frame, and through groves (24) formed in the stamps. A punch (66) held by a cylindrical holder (60) is inserted in holes (58) formed in the frame above the stamps and is struck by a hammer or the like to imprint the characters formed on the stamps into the surface. The holder is held in position on the surface by means of magnets (46, 48) which are adjustably attached to support assemblies (14, 16) attached to the end plates.