During the 2nd World War , the Nazis were well known (esp. during the latter years of that war) for using silver coins for replacement buttons on uniforms for their troops (on occupied soils) .
Often they were soldered together by forced/slave/prisoner labor .
My father , who'd served in the 'European theater' with Patton , in the Armored Infantry , brought back several silver antique 1700's French coins that had been 'turned' into buttons ... he'd said that he had cut them off of a dead German soldiers' greatcoat .
He gave them to his Captain , who returned them to my dad .
Pop told me that it was at that point in time that he'd realized that the Axis countries were losing that war .