In a PDF of an old issue of Crescendo Magazine (link below) I came across a reference to a Mandobass instruction manual that was published by Gibson in 1913.
I found one that had been sold via Amazon in Spain, but nothing else beyond copyright entries.
This is a huge long-shot, but does anyone have a copy or have heard of it?
(https://urresearch.rochester.edu/fil...mFileId=184000)
