Oh yes, I'd forgotten about this thread. It's definitely a Qume, and the following ribbons fit:
Qume Sprint 7, 8, 9, 10, 11
Apple LQP
AT&T 455
Burroughs AP1305
Lexitron VT 913, 921, 942, 1201S
Exxon 500, 5000, 935
Wordplex 80-2, 80-3, 80-4
Honeywell 24, 25, PRU7200, 7201, 7202...