It certainly LOOKs like Oregon-style chain. But most mainline manufacturers clearly identify their chains: Oregon, KOX, Carlton, STIHL, Tri-Link, Archer, etc., etc., etc., OR with the 'private label' of a saw manufacturer (Husqvarna, ECHO, Dolmar, etc., etc.).
A 'blank' chain is a red flag. Along with the 'A6', which HarleyT notes is not a standard Oregon designation (or Calton, Archer, TriLink, STIHL, . . ?). Together, it looks like an 'aftermarket' / clone / copy type chain to me. The boxes are available separately, so any chain can be put into them.
There is enough doubt in my mind, that it would be up to your dealer to 'prove' that it is genuine Oregon chain, if that is how it was represented. Ask to see the reel it was made from, if they made the loop. They may state that it 'replaces Oregon wxyx chain' - a weasely way that some aftermarket product is represented, but which should not go out in an Oregon box.
Philbert