#170086468590 appears to be like yours, Del, with the exception of the missing or blank shield. We may be seeing glue where the shield came off, or a blank dummy shield. Hard to say, but look at the shadows in the closeup. But the knife is Delrin (Staglon) not stag. The second blade etch might well have been deleted for the production after the photosample was made. Such is the life of 'event enhancement' SFOs.
#170084088786 appears to be a photosample as well. Almost all of Schrade's patterns were sampled in burnt stag at one time or another after the embargo lifted and supplies became available. I don't see anything about a '50th anniversary' on that knife though. He doesn't say anniversary of what. Wasn't the Stampede since the first Calgary Stampede was held in 1912, '62 being the 50th? And it wasn't Schrade's 50th. But...they made a lot of event SFO's, so it could be somebody's fiftieth. But without context documents, how do you know? I'd vote for it being a 5OTES sample for Europe. That would be circe 1992. I have a NEW ITEM LISTING sheet from 1991 for a 5OTE with walnut handles. And there were quite a few samples made up for Europe with burnt stag later.
There seems to be a lot of confusion between what is a prototype, and what is a sample. Some sellers play on that to make their wares sound more exotic.
As for what that cert says...well...the paper is too slick to make good toilet paper. And I've seen too many of these signed but blank to believe whatever whoever typed, printed, or fancy caligraphy inked into the blank description line.
It is a nicely stagged knife, and if that floats your boat, buy it, not the hype or cert.
Michael