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). 

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.

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.