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Tom BoblittI had about 80 or so T213's.......about 65-70 series II's, 5-8 Series III's (with 3-4 overprints) and 2-3 Series I's. The series II's are most common but HARD to find without a crease or heavy cracking like T207's. The III's are easier to find cleaner because they didn't have the shellacking and were trimmed tighter, so you see more great condition ones. Series I's seem to be very tough in any condition. Wish I had 'em all back--especially the overprints!
Scarcity can be a double-edged sword. THey are scarce but the demand just isn't there for them. Think it may be because of the condition-difficulties on them. Anyway, good luck with them. Try www.gfg.com for some........