The top button operates the double-exposure prevention scheme. The bottom button sets the automatic exposure counter.
The big knob advances the film and provides the user with the names of discontinued films. A quality piece from Rochester, N.Y.
Photos were done on Pan-F film rated ASA 50. HC110(H) for 11 minutes.
#1 Building on Belchertown State School property (gone now.) Others at UMASS Orchards on Sabin Street, Belchertown, Ma