Source : Webster's Revised Unabridged Dictionary (1913)

Stamper \Stamp"er\, n.
   1. One who stamps.

   2. An instrument for pounding or stamping.

Source : WordNet®

stamper
     n 1: a workman whose job is to form or cut out by applying a mold
          or die (either by hand or by operating a stamping
          machine)
     2: someone who walks with a heavy noisy gait or who stamps on
        the ground [syn: {stomper}, {tramper}, {trampler}]
     3: a power tool that stamps; "a metal stamper" [syn: {stamping
        machine}]