I didn't notice until you pointed them out that yours has ear pads. That would lead me to lean more towards aviation use, but as I said they were used for both.
My Buco does not have padded ears, and has the same buckle strap as yours does. Mine also has the small button straps behind the ears, which I've always assumed were to hold goggle straps in place.

Darin Sheffer
Always looking for Mobil and Marathon items I don't already have!