i have a second-generation Superbe Pro road double crankset, like in the second picture on the following page.
https://www.classicrendezvous.com/Jap..._sup_grp79.htm

i also have two bottom brackets, which i believe are from the same period. one is marked Superbe Pro 68-S and measures about 109mm. the other is marked Superbe 68-W and measures about 113-114mm. does anyone know which would be correct for this crankset? i think phil wood recommends 110.5 for superbe pro. i've heard of both ~109mm and ~112mm spindle lengths for the matching BBs.

i have the same crankset and i am wondering this too...
sheldon's chart lists the spindle length as "Campagnolo 111"
https://sheldonbrown.com/bbsize.html#suntour

ps.: let me know if you want to get rid of your 109mm bb