Prop Idendification Help

[Susa]

Got this propeller from a hanger sale. Looking for information on the manufacturer, etc.
A "Bolstad" or "O.Bolstad" aviation logo stamp is on one blade. Length is 68". E-1007 over 68-60 burnt into the blade. 6 holes around a center hub.
Seller said it had been on a Pitts Special.
Thanks for any and all help.

[Dbahnson]

I'm guessing that it may be an ultralight propeller. The center hole is too small for the metal hub assembly that's typically seen on certificated aircraft. I've never heard of that manufacturer either, but my having never heard of it doesn't negate the possibility that they built certificated propellers.

The stamp "68 - 60" simply represents diameter and pitch in inches.