In addition, the eagle logo on the auctioned guitar likely isn't original. As I've noted elsewhere in this forum (forgive the redundancy), Wolf, which all agree was built after this guitar, originally had an Alembic logo on the peghead, along with another design that Irwin has referred to as his then peacock logo. It was only following the Europe '72 tour, on which Wolf was dropped and cracked the headstock, that Irwin repaired Wolf and at that time removed the Alembic logo and added his eagle logo. Thus the eagle doesn't appear to have been Irwin's logo at the time the auctioned guitar was built, so it is much more likely that it, like on Wolf, was added at a later time.
Bill, tgo