Antique Disston cast iron keyhole saw blade handle. The handle is approx. 11 cm long. It has an end opening to slide
in a blade and a
thumbscrew
to secure it.
The blade holder is marked
"Patented AUG 28 1877" which relates to Patent No.194,659: Patented
Aug. 28.1877 HENRY DISSTON and JOHN H. VANDEGRIFT, of Philadelphia,
Pennsylvania, have invented certain Improvements in Handles for KeyHole
Saws (see image from patent).