Oh, I think it is a pretty safe bet that this was one of the 691 guns that Smith produced when the military contract was ending as is outlined by Handejector in the S&W forums. As he stated, because these revolvers were not part of the contract, they were not numbered in the 455 series, and the numbers are a continuation of the regular Nframe (44HE) you already know the possible aproximate shipping date as outlined in the letter Jinks sent me.although mine went to England. My gun is British proofed - crown over V- barrel, frame, and all six cylinder flutes. Best have yours lettered... its fifty bucks American, but what the hell..... cheers