Made six of these and one of my giant Railroad Spike Ashtrays for RoMa Craft Tobac. They're shipping out tomorrow! Basically, they're standard ashtrays with an engraved brass coin that bears the RMCT logo. I clipped some nails and used them to hold the coins in place. Soldering the brass on the steel might've worked, probably would have been fine, but... I like to go overboard.