Weston Master III Universal Exposure Meter Model 737 / S141.3: 1956, USA and UK manufacture. Brushed steel cased USA meter (left), the rare red dial UK model (centre) and standard glossy black enamelled model (right).  

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One option for fitted cases for this series of meters is shown here. The back section of this ever-ready case has a recessed compartment to house the invercone and filter for high light levels. The Master IV and subsequent Masters had a redesigned perspex invercone which was protected in a separate 'satchel' type leather case.