Andrew,
So outside AB, BL, Cycle, Drum, PB (not all), Piedmont (not all), SC & Sovereign, all others have a black and you want to say the blue signature is the variation.
If that is the case, then I would say that the Black Signature is less common.
I have looked at all T205's currently on ebay this morning and most seem to have the blue signature including the Sovereign & SC backs listed on there. It appears that the Cubs variation has the Black sig and the Rustlers has the blue. Do you know if both team names come with both signature colors?
I also find it strange that you would now be posting these T205 polls right after you decided not to collect the set any longer. Not saying that you have an ulterior motive, just the timing seems coincidental.
r/
Frank
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