Definitely sounds like a development release to me. I'm curious as to what happened to 7.2 if this is the case!
The only other thing I could think of was System 7 Pro, which has the version number 7.1.1. It's actually sort of rare; I've only seen it out there a few times and it wasn't too popular in its day. 7.1.2 is the only other non-Performa release prior to 7.5, and this was the one to add Power Mac support--sort of like that version of Tiger to add Intel support (I don't recall which version it was offhand).
I'm curious as to whether or not there's a System 6.0.9 prototype out there--maybe one they were making when they developed the Quadras. Imagine System 6 on a first-generation Quadra...probably would equate to running Windows 3.1 on a Pentium II...
The only other thing I could think of was System 7 Pro, which has the version number 7.1.1. It's actually sort of rare; I've only seen it out there a few times and it wasn't too popular in its day. 7.1.2 is the only other non-Performa release prior to 7.5, and this was the one to add Power Mac support--sort of like that version of Tiger to add Intel support (I don't recall which version it was offhand).
I'm curious as to whether or not there's a System 6.0.9 prototype out there--maybe one they were making when they developed the Quadras. Imagine System 6 on a first-generation Quadra...probably would equate to running Windows 3.1 on a Pentium II...