The Model 20 is produced in the following variations:
Prosp2001-Mini2
r20-67-1
R20-31-neu

All R20 barrel organs have 20 tone intervals, with the number of pipes differing from model to model. For more details just follow a Link.
All Raffin organs come with a 5-Year Guarantee.

S1-R20-Z-2
R20-40-2
r20-67-2