From my Tete Montoliu research, I have discovered this session (different from the "Ben Webster Meets Don Byas" session, and actually recorded two days later):
Date: February 3, 1968
Location: SWF’s Studio, Karlsruhe, Germany
Label: [radio broadcast]
Don Byas, Ben Webster (ldr), Don Byas, Ben Webster (ts), Tete Montoliu (p), Peter Trunk (b), Albert 'Tootie' Heath (d)
a. Perdido (15:14)
b. Stardust (5:12)
Omit Don Bays (ts) on b.
Broadcast on SWF Jazz Session program.
I know this has been issued on a disc called something like "Tenorbattle" or "Tenor Battle", but I have no further reference (label, catalog number, additional material included...).
Any help is much appreciated!
Regards,
Agustín