Made in 1939. The S- prefix occurs on a number of Zeiss lenses, e.g., S-Biogon, S-Distagon, S-Tessar, and is short for Spezial, special in English. It usually means that the lens is intended for use close up.
A 120/6.3 Tessar might just cover 4x5 at infinity.
As for putting it in a 120 folder's shutter, the cells might or might not fit. If they do the focusing scale will probably be badly off. But trying is cheap and until you've tried you won't know what it will do or whether what it does pleases you.
If you can shutter it and have a Cambo board that will accept the shutter, give it a try. Trying is cheap.
Nowadays lenses like this one -- almost but not quite known quantities -- are invitations to tinker and experiment.