Tissot Jumbo Flieger 44mm

Great thread !
I made a research and could not find any info on the 39.3 movement anywhere. So I guess you used a different movement for parts, probably from pocket watches. Most pocket watches from that era have a 38.2 movement with flat hairspring. So when asking for a donor movement, what movement are you refering to ?

I see your watch has a breguet hairspring, so maybe this could fit ?

According to litterature there are basically the 17, 18 and 19 lignes movements. Those movements are later called 38.2 : 17" , flat hairspring 38.2A: 17" , Breguet hairspring, 40.5 : 18" , flat hairspring and 43 : 19".
From what I understand, 38,2 , 40.5 and 43 have the new bridge layout.
Your movement has the old layout so is linked to the 17", 18", 19" family of movement.
I have found in a balance staff catalogue in which the 18" is the 115 and the 210 using two different balance staffs.
Finally, those movements are often not marked.
Quite a mess !

I would try buying a same size movement with the old bridge layout and a breguet hairspring balance.