Welcome to the board, Andy. For comparables, go to Holt's Auctions, auction #A0315 (the current auction set for March 19 (I think), look at lot #1418, 1441, and 1450. Lot #1418 looks to be very close to the Original Quality (OQ) of the gun in the photos and near a similar Current Condition (CC). It has an auction estimate of BPS 1,000 to 1,500. Lot #1441 looks to be similar in OQ to your gun and lot 1418. However, it has had a bunch of restoration and, so, estimates at BPS 800 to 1,200. Lot #1450 is a higher OQ grade gun and in higher CC level than the two others. So, it estimates at BPS 3,000 to 5,000.
My valuation chart shows that the current market considers Lang as a Brand Value level two (BV2 = 3/4 of BV1 Boss, H&H, Purdey, & Woodward for similar OQ and CC). The OQ of "your" gun and #1418 look like "C" grade SLE's which is OQ4. If we assume CC at CC6 to CC7, we have BV2-OQ4-CC6 = $2650 (USA) and BV2-OQ4-CC7 = $1,850 (US). Lot #1450 looks to be an "A" grade (OQ2) gun in "heavily used but unabused condition" which makes it BV2-OQ2-CC4 = $8500 (US).
I'm a bit concerned about those barrels - pits and dents.
DDA
