It's my understanding that MLB games we not saved in their entirety
until the mid to late 1970s. My recommendation to you would be to
check out Doak Ewing's website
http://www.raresportsfilms.com/otherbball.html
He's got probably the best and oldest collection of vintage baseball footage
out there. I think the oldest game in its entirety from his collection is
from 1969. He's a reputable guy who've I've dealt with on many occasions.
ErikV