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JohnTed, I averaged the colors using Photoshop and a lab color program the colors may look close but are they are a bit different none the less. Hope this helps in fact the percentages that make up the colors are below in both RGB and Lab CMYK. I also discarded any color patterns that may have been embedded in the below scans. I also included the last Cobb/Cobb backed cards that haven been offered publicly, including Jim's hope thats ok Jim?

American Beauty 460, Color: #629955
R: 98
G: 153
B: 85
C: 66
M: 21
Y: 85
K: 4
Ty Cobb, Color: #558E61
R: 85
G: 142
B: 97
C: 70
M: 25
Y: 75
K: 7
In fact in looking at the lettering the script is similar but not exact, I’m sure I could research the font and find that it was a popular period font or type face. I broke out the letters for you to see, you are correct they are very close but not exact IMO.

Hope this helps you a bit…