I spotted a nickel combat commander yesterday in 9mm that has me interested. The slide isn't marked series 70, but the serial # starts with 70####. Am i correct in assuming it is? Also my book says that the satin nickel finish is rather scarce and I was wondering how you can tell factory from aftermarket. The finish has the "aged look" with only a couple of places on the corners where it has rubbed thru. I should add they wanted $425 for it. Good buy or not? It woud seem to me that considering you don't see too many 9mm commanders in this series it should be a decent price.