Another Scottish maker:
Have just acquired a "James Burrow" of 116 Fishergate, Preston .500 3" BPE
28" steel barrels, rebounding locks, Jones underlever, London Proof on or after 1887

Seems to be in pretty much original unrestored/unrefinished condition. Wood is solid with probable original finish, some faded colors left on the action, barrel black is thin and largely faded to a mottled brown patina. Lockup is on face & tight as new. Forend will need to be tightened back up against the frame knuckle but that's about it.
Initial test with 136grains Swiss 1 1/2, card & lube wads, and 340grain hollow point paper patch from a Steve Brooks mould show great promise.
- Mike