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Genuine yellow filter for the Hektor 7.3cm f1.9, with product code FIOPY. It's a slip-on type manufactured around 1933, marked as No.0 and featuring a thin yellow tint.
Despite its small size, it's remarkably well-made, with a velvet lining on the back for secure attachment to the lens. It has been confirmed to fit the Hektor 73mm lens.
The paint on the exterior shows minor wear from normal use, but overall it remains in good condition. There are no noticeable distortions or prominent scratches.
This lens has been tested for rangefinder coupling and dual-image accuracy using our standard lens and a Leica M-type demo.