More info...
I got a chance to see these in person.
They are on heavy stock and are NOT flimsy at all, if you were to bend one slightly they would crease.
The backs are a textured bluish-gray color and many of them are discolored to a greenish yellow color from age around edges and you can tell they sat still somewhere for a long time in a stack.
No pinholes. Not all of them are stamped on back.
The newest pics I could ID are a Jackie Robinson sliding, and a Satchel Paige (sitting on ground against a fence in Cleveland Uniform), Pete Gray, a 1950 Era T.Williams, and some football/Olympics/Globetrotters that look to be ca1950.
No Babe Ruth, Joe Jackson, Mantle, Mays, etc. I suspect the Ruth was printed but is just one of the 30 missing from the 100 card set.
The earliest pic are a couple Pugilists from the 1880-90s, a 1895 Football team pic, a billiards player, and a very early Lajoie pic, then would be 2 1905 Era NY Giants pics, Mathewson, and Mathewson/McGraw/McGinnity.
4-5 woman golfers, 4-5 men golfers, a couple jockeys/horses, 3-4 race cars, 2 basketball (James Naismith and a early Globetrotters), 6-7 football, most were baseball... including 1919 Black Sox, Landis, etc.
I ran out of memory on my camera after 1/2 the stack so didnt get pics of the later cards, yet. The higher the numbers the more modern the pics. span was 1880s to ca.1950
a few examples of the non-baseball ones below
(if you can ID the football player, golfer, portrait, etc. that would help.)
Dempsey vs. Carpentier,Jersey City, July 2nd,1921
(thanks Clayton
)
Bobby Jones
Thorpe
??
4 horsemen