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Posted By: Richard

Ty Cobb Bat Off

PSA 6 - $4170
PSA 8 - $17985

multiplier: 4.3x

Ty Cobb Bat On

PSA 6 - $4060
PSA 8 - $23633

multiplier: 5.8x

Ty Cobb Red Port

PSA 6 - $3550
PSA 8 - $13397

multiplier: 3.8x

Ty Cobb Green Port

no psa 8 data available.

Edited to say:

Looks like a 4-5x multiplier is about right.

In addition, I would think that the multiplier with a rare back is less as the total dollar amount increases.