Will this be appropriate for an alox knife?
To me, this question is completely different from your original one. I can answer your original question: The large Elinox stamp does occur on 84mm Alox SAKs, as can be seen in the attached image.
As for the appropriateness of repairing a vintage SAK by using a replacement part that somebody believes to be "the same" as the original: I personally consider such a thing to be a kind of abomination. If a vintage SAK needs to be repaired, I think that it's better to do it by using a modern part that makes the repair obvious. Otherwise, in a sense, you are creating a forgery.