Reciprocating marking stamp with removable printing element

Claim 1

A RETRACTABLE STAMPING DEVICE COMPRISING AN INTEGRAL UNIT HAVING A FIRST CUP AND SHANK, SAID FIRST CUP COMPRISING A BODY PORTION AND A DEPRESSIBLE SHOULDER PORTION CONNECTED TO SAID SHANK, SAID SHOULDER AND SHANK TOGETHER FORMING THE TOP OF SAID FIRST CUP, SAID FIRST CUP AND SHANK EACH HAVING AN OPENING WITH SAID OPENINGS BEING IN OPPOSITE DIRECTIONS, A SECOND UNIT ASSOCIATED WITH SAID FIRST CUP COMPRISING A SECOND CUP OPENING IN THE SAME DIRECTION AS SAID FIRST CUP HAVING A SMALLER DIAMETER AND SHORTER HEIGHT THAN SAID FIRST CUP AND CONTAINING AN INK RETAINING MATERIAL FIXEDLY SECURED THEREIN, AND MEANS FOR LOCKING SAID SECOND CUP INTO SAID FIRST CUP AND SHANK, SAID FIRST CUP, SHANK, AND SECOND CUP HAVING THE SAME VERTICAL AXIS, WHEREBY SAID INK RETAINING MATERIAL AND SECOND CUP ARE CONTAINED COMPLETELY WITHIN SAID FIRST CUP WHEN IN A REPOSED POSITION AND IN CONTACT WITH A WORKING SURFACE WHEN SAID SHANK AND SHOULDER ARE DEPRESSED.