[Anthony S.]

1909 set (76 cards)
1910 150 series set (40 cards)
1910 175 series set (175 cards)
1911 Red backs (175 cards)

1910 175 series are the easiest cards to locate. There seems to be some confusion about a 1910 Beall existing (it's been included in checklists for years, but doesn't seem to exist).

1911 Red backs are next easiest to locate. Some beautiful images in this set. It repeats some of the images from 1910 set (blind guess without checking, maybe 25%). The Ten Million and Buck Weaver are far and away the most expensive cards in the set.'

1909 Obaks and 1910 150 series are tougher than the previously mentioned sets. The 1909 Gandil is the priciest. The 10 1909 horizontals tend to command somewhat of a premium over the other cards, with the Mohler horizontal being the most unusual. The 1910 150 series is very tough, but there aren't that many of us collecting them and they tend not to command the premium over the 175 series that you might expect given their comparative scarcity (at least recently).

T4 cabinets are a beast.