Since this ice screw has no mfg markings on it and it is listed differently in a few catalogs, I have listed it in the museum as UNKNOWN #15 Ice Screw - Possibly made by Steidle, or Salewa, or Stubai- Weight: 168g
Sporthaus Schuster 1967 ASMU catalog shows the twisted ice screw and lists it as "Spiral-Eishaken, weight: 130g
Hei-Ha Sport Koln 1969 catalog shows the twisted ice screw and lists it as Steidle-Spiral-Eishaken, weight: 150g
The Au Vieux Campeur 1972 catalog shows the twisted ice screw and lists it as a Salewa product
The Hei-Ha 1975 catalog shows the ice screw being made by Steidle, Item #311 - Weight: 150g