No need to apologize for bidding on a knife that interests you. It is a public auction and people from many nations buy there. I don't feel bad about loosing a knife (like the FIRST PRODUCTION 165OT NIB HINGED BOX WITH STONE), and as I said, this particular one holds my interest specifically because it is unstamped. It is possible it was a second, but I don't think so. A second generally has at least a defaced stamp. My best guess at this point is that it was one of the knives held in stock for warranty replacement. By leaving off the stamp, it would be possible to use it to replace a Schrade, Wards, Sears, or other stamped knife. It may have even has an etched stamp at some point. One of my 15OT's has an etched stamp. I am also guessing that the lack of stamp was a put off to many unsure bidders, causing it to go for such a reasonable price.
You'll find you 165OT shortly, I am pretty sure. They aren't as common on eBay as most of the Old Timer slipjoints, but there is a fairly steady parade of them in all conditions.
Michael