Coincidentally I was at a LGS yesterday after work and saw almost a twin to yours. It caught my eye because the tag said S&W 1917 .455 Webley. I knew that wasn't right. Other than it clearly was an N frame, it was nothing like my 1917. The barrel was 6 or 6.5 inches, not 5 inches and it had been fitted with target sights almost identical to yours. The finish was much more worn. I thought it may have been a rebarrelled and modified 1917, but the .455 caliber threw me. As a finish worn modified 1917, including rechambering, I didn't think it was worth anything close to the $800 tag price so I moved on.