you are probably correct, I though the Team replica with Oria ML34 took the Stelvio as a base.
Going back to the topic , could just that frame be a Banesto Replica with Event tubing from the late 90's (95+)? It looks the same as the Oria ML25 replica (93, 94?) , so probably when Pinarello started to use rebranded Dedacciai tubing aroung 95, just built the bike with the new Event tubing instead or Orial. I could not find any info on Event tubing (first time I heard of it by the way!), so can not say which is better. But saw Cyclomondo has decals
Hope it helps. Not a top frame I'd say but as I'm a Pinarello fan that frame looks pretty beatiful to me , and it is in quite good condition.