Hi jhp,
I agree, it sure looks like a Shakesphere, Kaibab.
That is a really nice bow. I have an Shakesphere Ocala, which looks very similar but the riser is a bit longer and the overall length is 60".
They are kind of hard to find, but they do turn up now and then.
My Ocala is a great shooter too! Smooth and fast. Even at it's lower draw weight of 53# @ 28".
These are very underrated bows in my opinion.
The design is attributed to Ernie Root, who worked on the design team for Shakesphere when they aquired the Root Bow Company.
Good luck.
Harry.