Batter-Up cards are as underappreciated as Eddie Collins is as a top tier Hall of Famer. Here are a couple of threads that detail what Net54 was able to pin down 4 years ago about the distribution of colors and possible sheet size.
The first thread:
http://www.net54baseball.com/showthr...ghlight=batter
The follow up thread:
http://www.net54baseball.com/showthr...ghlight=batter
It was neat seeing how the color and sheet size theory developed in these threads, something that I had never seen discussed before.
Brian