I found a completely squashed item that I thought was a car part 7ntil I saw the quadruple plate stamp....quadruple plate is a better quality see below for what I found:
“Quadruple silver plate items are NOT plated four times, the simply were plated with four times as much pure silver as any other hollowware item.”
“Quadruple silver plate hollowware was some of the highest quality made during the later part of the 19th century. Within the silversmith and silver manufacturing industry, items marked "Standard" silver plate indicated that 2 troy ounces of pure silver were used to silver electroplate 144 teaspoons, but "Quadruple" silverplate used 8 troy ounces of silver to plate the same 144 spoons. “