Reynolds SX-08
Bari Sax

Serial number 713xx

The consensus on SOTW is that this is a Keilwerth-made horn.

I am trying to get some info on the 3070 Armstrong to see what the relationship might be.

I want to do some work on it yet, but if you are interested...well, an interested buyer would motivate this to move towards the top of the to-do list.
Probably needs to be someone local who can come in and see it.