As reluctant as I am to create one of these threads... I'm a bit stuck on this one and could use some help.
Looking at BestFit, the closest thing I could find to the keyless works is a Urofa 55. There is a very strong resemblance, but the set lever jumper is slightly different due to the placement of the screw hole and the post for the intermediate setting wheel. Looking around online, most Urofa 55s seem to have a independent escape wheel cock (though not all) but otherwise the train side looks right. However the keyless works on the images I see online (like on Ranfft) are quite different, with what looks like a long sprung yoke. Is BestFit perhaps wrong or could the design have changed? I looked around a bit at other Urofa movements and nothing I found seems very similar. The marking on the in the second picture (looks sort of like HFB) wasn't anything I could find info on, and the "GUBA" scratched into it doesn't seem very promising...
Oh and the diameter is about 23.86mm so a bit over 10.5 lignes?
Thanks for any help!