Apparently a version of Castle, expanded into a series of 7 weights plus outline and shaded styles, shown in an undated Typeshop catalog as Salzburg Serial.
Digital versions include Salzburg Serial (SoftMaker), TS Salzburg (TypeShop Collection), both in 7 weights plus obliques, and Salzburg RR in 5 (upright) weights, “retooled from the QBF Collection [in 1997].” [ITF]
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