Two tops with the crowns printed as Yankee Boys but very unusual were just auctioned on Ebay by the same collector (
1,
2, but it seems there was some kind of problem with the first auction because it has been
relisted).
The first one appears to be a just a Double Header that was printed with the Yankee Boy logo, like the one Richy mentioned:
Except that if you look carefully, the tip of the larger top is not the usual one for a Double Header (or Yankee) but a ball tip.
Does yours has this tip, Richy?
The second one doesn't look at all as a Duncan top, it is a one-piece wooden top (pictured beside a regular Yankee Boy):
The shape actually is very similar (identical ?) to that of Royal Champion Trom-Po from the 50's
EDIT: I contacted the seller about another auction I won and asked him if he was a collector. He said no, he had purchased 1350 tops from a collector in Oklahoma City!