Artur,
There is not a lot of difference between a S6 and a T6, or as they would be known in 1931, the D31 and E31. Both used an EQ prefix engine and a YF prefix frame. There were some minor trim differences, but the biggest difference was the front forks. To verify if it is cataloged correctly in the LDMCC Register, the D31 (S6) has a central compression coil spring. The E31 (T6) has two extension coil springs at the sides.
-Doug