Thanks to all. The gun is NOT a hammer gun, and IS pre 1898. From what I can tell, it is a 100% coverage engraved intercepting sear sidelock with ejectors. The engraving is a particularly fine style of tight scroll, could be the house style that Dig aludes to. The gun has been sleeved, and is so marked on the rib, along with the London address of the company that did the work. The barrels look perfect, the rest of the gun shows use, and some symptoms of poor storage, pitting here and there, 0% case colors, and a stock that would best be refinished. No case or extras, owner is pretty firm at 5 large.

It is a very pretty gun, perhaps just a bit more character showing than I like to see, but, nice at any rate.

Thanks again. I'll pass, I believe.
Best,
Ted