The glass plate negatives are pretty neat, in my opinon. Henry had a lot of glass plate negatives of ball players many years ago. There were stars and the average player alike in the offering he had. The stars went for much more than the average players. Lucky for me Ernie Nevers wasn't a star baseball player.
Just saying.... if one of those glass plate negatives was associated with an image on a card it would probably have a pretty good premium.... again, I'm just saying....