Heavy duty smoke alarm made by U.S. Safety and Engineering of Sacramento, CA circa 1970s - 80s.
Info from back label: Vulcan Autosonic PVR Mark-I Smoke Detector
Sensitivity: 2% visible smoke
120V AC 60 Hz .06 Amp.
Maintenance: Brush dust from inlet at 3 month intervals
Return to manufacturer for service or adjustment
See PVR Mark-1 Owners Manual for mounting and wiring instructions
Test unit every week: 1. Lift lamp contact for trouble signal
Additional light bulbs may be obtained from: US Safety & Engineering Vulcan Headquarters 2365 El Camino Ave. Sacto., CA 95821
Photoelectric Smoke Detector Serial number 57627
Move test lever for sensitivity test
Sold as is. No instructions. Unit has a plug.
Purchaser may be able to obtain information from manufacturer: 2365 El Camino Ave. Sacramento, CA 95821