Victorian Pewter Glass Bottom Tankard

A very heavy old glass bottomed Victorian Pewter Tankard with Half Pint markings, measuring 4" in height. I'm told the glass bottoms were introduced because the Press Gangs paid offsiders to drop a shilling into unwary drinkers tankards....with the glass bottom you could of course spot this so could not have your beer tipped out and be found guilty of "having taken the Queens Shilling" and suddenly find yourself aboard ship without a "how you do". Nice condition.