Curio collection
Weston Master II Universal Exposure Meter Model S141/735
United Kingdom, 1946
About the object
The Weston Master II is an analog universal photographic exposure meter housed in a molded black phenolic case. It features a dual-range dial system coupled to a hinged perforated baffle over a selenium photovoltaic cell. This unit includes its original tan leather case with velvet lining and neck strap.
About this object
British-made selenium cell light meter by Sangamo Weston
Condition
The exposure meter shows light cosmetic wear consistent with age, with intact black casing and legible dial markings. The selenium cell lens array is clear, and the rear baffle hinges smoothly. The fitted tan leather case shows surface rubbing, edge wear, and intact stitching with an operational snap.
Provenance
Provenance documentation was not supplied for this specific Weston Master II Universal Exposure Meter Model S141/735; this listing is based on the supplied photographs only.
Model
Master II (Model S141/735)
Serial Number
A 12322
Patent Number
531996
Sensor Type
Selenium photovoltaic cell (battery-free)
Measurement Range
Dual scale with hinged baffle
Selenium Power
Operates without batteries using an integrated light-sensitive selenium cell.
Dual-Range Baffle
Hinged rear baffle shifts the galvanometer scale between high and low light levels.
Sangamo Weston Craft
Manufactured at the Enfield plant under UK patent 531996.
Calculator Dial
Circular slide-rule computer converts light values to shutter and aperture pairs.
Fitted Case
Supplied with an original tan leather pouch featuring plum-colored velvet lining.
Complete Markings
Retains original specification plate with serial number A 12322 clearly stamped.
Dual-Range Photometry
Visible in photo three, the hinged baffle flips open to expose the honeycomb selenium cell for dim lighting, while closing the perforated flap restricts light for bright daylight measurements without needing separate neutral-density filters.
Precision Enfield Engineering
Visible in photo two, the stamped Sangamo Weston plaque documents the Enfield factory's role in precision instrument making, delivering reliable post-war photographic meters that operated independently of external battery power worldwide.
1939 · Weston Master Introduced
Original Master universal exposure meter establishes industry standard.
1945 · Master II Development
Redesigned slimmer body and updated calculator dial launched.
1946 · British Production
Sangamo Weston begins manufacturing the Master II in Enfield, Middlesex.
1956 · Succession
Replaced by the Weston Master III with updated film speed scales.
Casing & Dials
Black body and aluminum calculator dial show mild surface handling marks without structural cracks.
Photocell & Baffle
Rear hinged perforated baffle operates properly, revealing an intact honeycomb selenium grid.
Meter Scale
Front galvanometer window is clear and legible with 'Made in England' and model text intact.
Leather Case
Original tan leather case displays surface patina, intact purple velvet lining, and secure straps.
- Materials
- Not documented
- Place & period
- United Kingdom, 1946
- Source collection
- Curio Gallery · Curio collection