Warren,
The "Old Black" Micarta has a blend of black / green / brown grain to it that will look different than the current Black Micarta, depending on the cut & grind. You need to compare this Model #20 with the current Black Micarta to see the difference. With the round handle you have the difference will not be as apparent though. It is more obvious with a Model #14 with finger grooves. Some people actually think they have "Brown" Micarta, but I am told there is no mistaking the real thing. Unfortunatly I have never handled a "Brown" yet.
BTW - I seriouly considered chasing that #20 you picked up, due to the engraving, but I got distracted from the Auction & missed the ending.