Hi Ron
Interesting stuff.
I did a similar analysis with POLAR BEAR vs 1910 COUPON (T213-1) Major League (48) subjects in 2008.
Refer to this thread....
http://www.net54baseball.com/showthr...1654&highlight
Shown here are the 48- Major League subjects in the 1910 COUPON set. The 1910 COUPON cards were issued circa..Spring/Summer 1910.
My theory.....is this group of 48 subjects were printed from an early 350-only sheet of T206 cards. From this group, 39 subjects are POLAR
BEAR No-Prints.
The nine printed POLAR BEAR cards from this group are listed below.
1910 COUPON (T213-1) Major League (48) subjects


Confirmed POLAR BEAR Subjects from this COUPON group
Engle
LaPorte
Willett
and the Six Super-Prints....which of course went on to be 350/460 series subjects and have PB backs
Chance (yellow portrait)
Chase (blue portrait)
Chase (dark cap)
Cobb (red portrait)
Evers (bat-yellow sky)
Mathewson (dark cap)
TED Z
.