I don't collect stadium PCs per se, but I do collect some venue PCs that catch my interest. Here are a few:
Madison Square Garden, the Mecca of boxing, This mailing card-backed picture of the second [1890-1925] stadium of that name caught my eye because of the lower corner of the building, which plainly shows advertising for the Jim Corbett-Charlie McCoy bout on August 30, 1900. See the next image for a close-up.
A view of the next Madison Square Garden, actually a promotional PC for the Nedick's restaurant. The picture was taken September 9, 1949; the marquee advertises the Gavilan-Castellani bout that evening.
1965 Dodgers PC shot at Chavez Ravine. One of the ways you can date a Dodgers stadium photo is to look at the palm trees behind the pavilion. When the stadium opened they looked like pipe cleaners, with the fronds straight up.
This Drysdale you know was a few years after the stadium opened because the palms had developed pretty good 'beards':
1949 postally-used Ralph Kiner:
