This sale is for a really excellent condition Mamiya Gel Filter Holder, with an 77mm screw fit mount to suit all lenses that take a 77mm filter.
This gel holder is in great condition with only minimal signs of use – just the old adhesive (?) patch on one corner. Otherwise mint. Extremely hard to find in this condition – or in any condition really. A very rare item and suitable for all 77mm size lenses, not just Mamiya.