I bought an Outdoorsman last week, for a couple of reasons. I have a very early model from the 80's, and this is the newer, San Mai III steel.
It also came with what looks and feels to be a purpose made kydex sheath for it, which I'd not seen before. I suppose it could have been made after the fact and not sold by Cold Steel, but it looks like some of their other kydex sheaths.
And it came with some Certificate of Authenticity that this one came from Lynn Thompson's personal collection! Which all sounded more impressive than when I looked at the piece of paper and saw it appatently had been trimmed by a 6 year old with a pair of scissors. Not exactly a straight line at the top.
I've seen these papers before, and they're all blank as to the knife model, which doesn't do much for it's importance.
Anyway, it's a nice knife for what I paid for it. The Cold Steel vintage knives have come down in price from a few years ago, and you can usually get a Tanto or Trailmaster for 200-300 bucks, which seems like a deal even if all you wanted was a good working knife. I'm sure a new production Bowie would cost as much as a vintage Trailmaster.View attachment 2824315
That sheath is the Concealex model that Cold Steel sold separately (item #SK13AN) for years when the leather sheaths were standard. Though offered for the Tanto and Master Tanto, it fits the Outdoorsman also. I keep my own Outdoorsman in one and it carries very well. Yours is missing the original nylon belt strap/snap keeper assembly that attached to the sheath via screws.
I've been meaning to address those certificates of authenticity here in the subforum for a while. Since you're the first to own one and share it, this seems like a good time/place to discuss them.
I'm not convinced that they're real and I don't place much stock in them. First, as you pointed out, the serial number space typically is blank because most Cold Steel knives don't have serial numbers. Lynn Thompson would know that, so why would he bother including that line on a certificate? I've also seen serial numbers filled in for knives that didn't have serial numbers.

Second, the certificates are frequently misshapen like that, as though they were cut by hand from a larger sheet. That kind of shoddiness doesn't inspire much confidence that they are authentic.
And third, I've seen those certificates accompanying knives from several different sellers on eBay. Is Lynn liquidating his collection through multiple vendors via eBay auctions? I suppose it's possible, but I'm skeptical.
Yet, not too long ago, I saw an auction with a certificate accompanying this second-generation stag-handled Trail Master.

The tag attached to the sheath clearly identified it as a sheath sample from a firm called Burgess Leather, which is presumably the A.E. Burgess Leather Company of Grafton, MA.

Assuming the tag is legitimate (and it would be a strange thing to fake, though I've seen even subtler forgeries in the knife community), it looks like a genuine factory prototype that only could have come directly from Cold Steel.
I know Lynn said he had CONEX boxes full of rarities from his collection that he was going to be selling off. But that was years ago, before the GSM sale, and I haven't heard anything mentioned about it since.
So I guess I'm on the fence about the legitimacy of the certificates and I'll offer this: It might be interesting to know that a knife came directly from Lynn Thompson's collection, but I'm not relying on a piece of paper to convince me that it did. And I'd certainly never pay a premium for an off-the-shelf Cold Steel knife just because it belonged to Lynn. At best, those certificates are just novelties that lend some credence to knives that are actually unique, such as that stag Trail Master with its Burgess sheath. As far as I'm concerned, they don't add a dime's worth of value to an asking price.
-Steve