I was just a kid, but my dad took me to the first drawn game at Hampden in 1964 against Cambuslang Rangers.
I don't remember being at the replay which Burgh won.
I remember it being a big crowd, but I thought that was maybe because I was wee. I just checked on Wikipedia and it was 45,115 !!
Scottish Junior Cup - Wikipedia
The crowds were amazing in the '50s and '60s. 77,650 in 1951 for Petershill v Irvine Meadow.