The stamp starts at 1 3/4 inches in from the edgestamp is located at 12 o'clock in overhead picture of top of cymbali don't see any ink on it, but it's got a lot of club dirt on it.
Its an 18 so I'm thinking $125-175. Maybe more if its thin and has a "to die for" sound, $200 tops. I personally haven't seen a lot of thin 18" '50s on the market, but I just picked up an 18" thin early '50's trans stamp for $250. I think I over paid, but it sounded great!