I agree it appears to be a Brandom M-145. Therefore, you might be interested in checking out Lot 333 from this 2009 Eric Jackson Auction for the item. referenced to have been a mint, corner margin single, which realized $15.50:
http://www.ericjackson.com/auction/...xpaid+StampsIf Revcollector's 1976 catalog had it listed at $4, the auction price of $15.50 some 33 years later does not seem that far out of line.