Looks like a Hammerhead is only worth $21.50 in mint condition.. and I tried to snipe it and bid it up a few bucks in the last 10 seconds!
bcr123psu = schooled
I stand corrected. As you noted, I was basing my estimate on the assumption that the prices held constant since the circle stamp craze was in full swing in August/September (right around the time I stopped buying them).