In my experience most commercial releases on reel to reel were 7½ ips through until 1968, when more releases started coming out at the 3¾ ips speed. Some releases still came out at 7½ but these seem to have quickly become the exception rather than the rule as the decade turned.
I popped some thoughts about factory made reels here a while back, which may be of interest!
Location: Lancaster(-ish), UK
Posts: 16,937
I'm ChrisB.
Try having a listen to Stage by David Bowie
I read in Tony Visconti's book that it is 100% live with no overdubbing etc.
The only messing about is one edit where there were two performances from consecutive nights patched together on Station to Station.
I don't know what it's like on CD but the vinyl is extraordinary.
The begining of Station to Station has a steam train sound on it, leading into Adrian Belew's guitar intro. When I was a teenager, a friend of mine used to play that at full whack on his Dad's hifi (who was also our headmaster) after school. The whole (16th century half timbered) house would shake.
Dynamics or what!!