Nope! When I bought mine at Kettner, the Franco German distributor, in 1984 if I remember, I had the choice between the Standard, like yours, the Luxus, like mine, and the Professional (although this one was rare on the shelves). The Standard and Luxus were made and sold in parallel. I can tell you for a fact that my best pal and I bought ours - his a Standard in .243 and mine a Luxus in .270 - within weeks of each other.
Steyr Mannlicher did not offer (at least in Europe) a "de luxe" and all the "Standard" I ever saw had a fore end tip. Only the competition / benchrest rifles did not have one, but had a heavy stock often with ventilation vents in the forearm.
You have a "Standard", period, but the possible variation (?) with yours could be an "American" version with shiny synthetic finish and single trigger, compared to the traditional oil finish and typical double trigger sold in Europe. I am not saying that I know this to be a fact, I am speculating, but slapping a shiny varnish was the usual way to "Americanize" European rifles in those days, and a single trigger would make sense for an "American" version which the importer could very well have labelled "de luxe" (see I am trying to be nice to you)
