Melitta single cup filter holder and filters in box 1980 Germany

Here is a never used single cup filter with a box of 100 Melitta 1a filters as well as 2 filter holders and the original instructions. It is a system that requires a round paper filter to hold the coffee grind and used with hot water pouring over. There are only small  signs of age on the package, no signs of use. The original box measures ca. 10×10 cm or 4×4 inches. Check out the attached video on how to make coffee vintage style!