Dale, I'm not Del, but the knife in question here appears to be a genuine, pre 2004 SDH1. The only thing questionable about it at all is the 0921 serial number and the First Production Run 1 of 500 etch. I thinks Del's previous reasoning on the knife is correct. I have a mint original example serial nr.0460and it does not have any tang stamp or country of origin identification. The only identification is the Schrade/D'Holder etch on one side and the First Production Run 1 of 500 on the other The knife in question with serial number 0921 should not, according to records and information available, have the First Production Run and 1 of 500 etch. This indicates to me that Del's reasoning is right on track. I just happened to think, that the seller could have or may have miss read the serial number and if so it makes all the previous few posts just excercise.
Paul