Anything that fits in a copal 1 shutter will be perfect.
An Ilex 3 would be fine as well.
So far I have listed:
Nikkor M 300mm f/9
Fujinon C 300mm f/8.5
Schneider G-claron 305mm f/9
Goerz Artar 12" f/9 (?) is sometimes in a Ilex 3.
-OK, I will keep an eye out for these.
300mm Dagor - no
300mm Commercial Ektar - no