I did a search on the internet about a 6" Model 41. I am not saying Wikipedia is any kind of authority but this is what I found:
"Production history
In July 1947, two prototypes—numbered X-41 and X-42—were produced, tested, and improved for the next 10 years. In 1957, the Model 41 was made available to the public for sale when Smith & Wesson produced 679 units.[2] At the end of 1958, they had built 9,875 Model 41 pistols. A lighter 5-inch (130 mm) barrel was offered in 1958 for field use. The Model 41-1 was introduced in 1960 and was chambered in .22 Short for International Rapid Fire competition. Only 1000 were made using light aluminum slides necessary for function with the lower powered .22 Short.
In August 1963, the 5-inch heavy barrel version came into the market. Stoeger's Shooter's Bible of 1964 shows a 7+3⁄8-inch (190 mm) barrel grooved for Olympic center weights. The cocking indicator and 7+3⁄8-inch barrel were dropped in 1978. The 7-inch (180 mm) barrel was introduced in 1978 with no provision for a muzzle brake. A 6-inch (150 mm) barrel was offered for a few months in 1991. In 1992, the Model 41 was dropped from production. In 1994, Smith & Wesson returned it to production as the Model 41 (New Model).[3]"
This is why I am inquiring in this thread. I will probably need a letter to confirm if the barrel was actually 6" from the factory.