Its a Holland, 5 dram gun, hammerless, engraved, 18k is in the ballpark, anyway. You could have bought a Holland paradox, cased, best gun just sold in the same price range. A Holland 8 bore hammerless sold not long ago for more than 40k an all original gun cased with provenance. A Holland 8 bore paradox hammergun sold for 32k. A Holland 500/450 nitro sold about a year ago for close to 50k original, cased with provenance Hope this is some help.