Here's the order of scarcity I see the these FIVE subjects....and, their "scarcity factor" is really a function of how few T-brands each card was printed on. 1st & 2nd.....O'Hara and Demmitt (St Louis variations).....exists with just POLAR BEAR3rd & 4th.....Elberfeld (port-Washington) and Lundgren (Cubs).....exists with only with 3 diff. backs.5th.....Dahlen (Brooklyn).....exists with only 5 diff. backsAnd, I don't agree with the consensus that are saying Kleinow (Boston) or F. Smith (Chi & Bost) are "tough".Shown here is Smith with 8 of the 12 diff. backs that he appears on....I'm still looking for the remaining 4 to complete my run on this Smith card.And, Kleinow (Boston) appears with the same 12 diff. backs......So, how "tough" can these two cards be ?My experience is that these two subjects, while tough, are not in the same class as the above 5 cards.TED Z