Weston Master V Universal Model 748: 1963, UK manufacture only.
Aluminium shell on light grey plastic chassis. The first Universal Master to use a Relative Brightness linear scale for light readings. (Previously - only the Cine models).
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It also differs from the model IV in that the inward facing pointer lines up more ergonomically with the light values, and a full range of aperture and shutter speed values are printed. Also - the first model to quote D.I.N. speeds as well as ASA and Exposure Values.
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A push - release button for setting film speed makes the action easier, and a similar button on the side for the meter needle lock replaces the slider on the Master IV.
As well as the standard Weston Master V Model, a certain proportion were made with a dark red printing of the main legends in place of the standard black. At first glance the dark red may appear indistinguishable from the black, but when viewed at an angle in reflected light, the dark red tone is clear, and also present on the rear panel.
Weston Master V Universal (Model 748) Exposure Calculator Dial: Large Display, Marketing or Training Unit.
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Until I saw this listed, I had no idea that such a model existed. Vended from a French trader, the thick solid plastic base is extremely heavy. 6x linear life-sized, the true scale of this can only be seen if compared to an actual Weston master V (shown at the base). The three articulated discs that make up the dial appear to be manufactured from the same metal alloy as those on the real meter. As with the actual Master V, the film speed ASA and DIN scales, aperture and shutter settings, and the Exposure Value (EV) scales are present.
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So it can be used to demonstrate the use of the meter calculator dial, especially since it has the proud thumb-vanes at the edges of the pointer section. In practice however there is a problem: There is no lock on the film speed selector. So when one of the other sections is rotated, the set film speed also changes. Well, I suppose you can't have everything!
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I suppose, now that I have this, I can use it to start building an actual giant-size Weston Master V Meter. Anybody know where I can get a fifteen inch diameter Invercone?