The stamp unit and the base member further have interengaging means to lock or latch {TAIL ~ each stamp unit} in a position in which the printing surface of said stamp unit is in level with {HEAD ~ the printing surface} of the fixed stamp 
The stamp unit and the base member further have interengaging means to lock or latch { TAIL ~ each stamp unit } in a position in which the printing surface of said stamp unit is in level with { HEAD ~ the printing surface } of the fixed stamp
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH