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These filter hsgs were printed using a rubber stamp. Silk screening would be too difficult to manage on a arced surface. The stamp at the plant making these would have been curved to match the hsg. A rubber stamp co. could make the stamp but more than likely they would make the stamp flat. For small runs or one at a time jobs just ink the stamp and roll the hsg. A mask could be made and the white sprayed on but the stamp process makes it more like the original look. One thing I have found tring to find old fonts is they do not exist in this computer world and it's difficult to have someone remake them so sometimes you have to do with a font thats close.