I just bought a used S&W .38 SPL +P airweight 637-2 and tried to find manufacture/ship date by looking in the S&W book online, as one of the newbies talked about in some of the posts, I could not find it. My Serial # is CJCxxxx, Also my gun has a lock on it but it did not come with the key and I could not find it on S&W website as an accessory or anything else, how can I get one?