I just received Gavin Gardiner's catalogue for the Gleneagles Sotheby's auction for 24 August. Pages 84 & 85 shows "a rare Holland & Holland 1 1/2 inch bore London Pattern Breech-Loading Punt Gun, No. 6373" It sports a 106 inch barrel black powder proofed for 4 ounces of punt powder and 12 ounces of shot. It was delivered from H&H on Christmas Eve 1880. It originally had a swivel mount but now is mounted on trunions like the cannon that it is. Estimate 10,000-15,000 GBP.Check it out at
http://www.gavingardiner.com Thought this might be interesting......George