LeonardMcCoy Not sure there was ever a contract. Glen played different acoustic guitars, although briefly, throughout his career. He genuinely seemed to prefer acoustic Ovations. I am not sure he ever really found an Ovation electric 6 or 12 that he really couldn't live without. From the 50's to the end, it appeared he preferred the Strat shape in his hands.
This picture speaks volumes in preferences.

- Glen Stair Guitar.jpg (1.19 MiB) Viewed 108722 times
My guess is just some haphazard irresponsible employee wanting to extend the picture and they had no clue about Glen's history and made it fit (poorly). And this came from the folks responsible for promoting Glen.
BTW...that guitar was for sale a year or so ago.