I've got these oddballs that i don't have a great idea exactly what they are......it's a custom Herrick as they all were......this one has a bad shank.....it's a bit nozzle shaped at the bottom...won't seat at all.....good news is that there is enough room to have it cut for reeves sleeves.....it's a very shallow cup, very sharp bite from rim to cup...28 throat.....it's a killer piece, just needs the final bit to make it workable...these don't come along every day....and with all of the herricks i've seen, never one like this cup