This Vintage 18k Gold Electroplated Men’s Signet Ring is a timeless piece featuring a square shape and a classic signet style. The ring is crafted from gold plated material, giving it a retro feel that is perfect for any occasion. With a band width of 4.5mm and a size of 10.5, this original piece is a unique addition to any man's jewelry collection. 
This ring is old. I see a patch of silver color metal in the back and it reads 18K Gold Heavy Electroplate
It looks like someone used an acid test on the ring which resulted in the silver metal showing. 
The weight of the ring is 8.23 grams
The front of the ring measures 16mm. The back of the band measures 4.5mm
Please view all photos before purchasing.