B+W 30.5mm Silver Original & Rare Sonnar R1,5 FIlter

Rare Silver B+W 30.5mm R1,5 filter for Rollei 35 Sonnar Lens: Excellent & Clear. 
 
The R1,5 is a colour compensation filter, particularly useful in elimanating colour shifts, especially blue tint. 
 
This rare and beautiful filter in excellent condition is an excellent addition to a Rollei 35S or SE.
 
B+W are a high end filter manufacturer from Germany. The quality of their products matches and in some cases exceeds all the best proprietory filters.