My guess for why so difficult is that there was just no demand and not much interest back then. If you didn't have a 55 AA to send them, you would just send a 3x5. All four of those guys are tough signatures even on 3x5's, but obviously Sinkwich and Harmon are much easier than O'Brien and Smith. I love that set. I wish more of the guys were available. I only started it within the last 10-15 years and I refuse to pay some of the ridiculous prices that some are getting. I don't fault people for it, just don't want it bad enough
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