Original 1930's Melitta coffee drip filter funnel cone number 102 for 4-8 cups of coffee. Marked Deutsches Reichs Patent. Melitta has been producing coffee filters and these cones since the early 1900's and even today they still make filters for this 102 funnel.
This funnel is their Schnell-Filter model with more holes for faster coffee. It is in decent condition, there is some light cracking on the bottom near the filter holes. There is some dirt / discoloration and it needs a good cleaning.
The advertisement in the photo is from the November 1940 issue of Frauen Warte.