Woodstock,
The info provided by the seller is pretty accurate. Bill G's research indicate that the "KNIFE MODEL" was made in 2nd and 3rd Variation configurations of the 2nd Model "AUTO EJECTING" revolver, time period 1901 (black powder until 1905) thru 1917. Vast majority of the known examples are Nickel plate, a few examples have shown up with blue finish. This variation was offered in the standard chamberings of .32 S&W Long and .38 S&W, but with a 4" barrel ONLY. Several examples have been seen with Japanese registration markings and English proof and purveyor markings - so it appears these things made it around the world. I think that starting price quoted is a bit high??? - but so few show up for sale that it is a tough call to provide a retail value. I do know that a collector friend of mine purchase one NIB with box at a public auction about 2 years ago and was glad to get that one for $2,000. I have two in my collection, a Nickel plated and a blued - one of which is the known example with the English proofs and purveyor stamp.