1980-2001 Peres-Steele Hall of Fame PC's
 

Is the total # of Postcards in this set that could be signed (108) ? 104 Hall of Famers and 4 non-player Postcards C-Kerr, D-Stack, E-Steele,Steele,Perez and F-Bush/Stack.

Also is the Bush PC more or less valuable if it is alone on the PC. Does Stack included enhance or reduce the value ? Thanks

Yes, 108 including the 4 non player sigs. That includes some pretty hard to find ones (because of death or illness so close to the release dates) like Paige, Lloyd Waner and Alston to name a few.
As for the Stack/Bush card, I would think since both are on the card, it would be worth more with both than just one...but that's just my opinion.

I was thinking the opposite. I thought maybe a single signed Presidental postcard would be worth more than if others also signed the postcard. But with Stack also on the postcard I was unsure. Thanks

I guess it depends on the collector. A lot of people want to get a sig of everyone on a particular item (everyone pictured)...other's don't care. I happen to like having everyone's sig. You could always try to get one of each version.