My Omega Reference 2576 with a Printed Omega Logo – Authenticity Discussion

Two examples from my collection with printed logo, 2576 ref. Additionally one wreck I just bought (mostly to try to get som better understanding of these ones), and a ugly redial 2491. The one to the left in 1st pic is clearly swapped into a later case (with bevels) and movement (344) I am looking for a swap back). Also see the case which is 2491 and 2576 dual ref.
What do I make of this? There could be examples of dials in the early era which was produced for non 2576 but went into that ref regardless. OR there is a number of versions where old dials have been transplanted.