Weston Master IV Exposure Meter, Model 745. 1960 UK manufacture only.
Does not use the term 'Universal' on the meter face. The dial legend also dispenses with intermediate markings for aperture (f stops) and shutter speeds. The meter needle lock makes it possible to use the meter for incident light readings with the Invercone when the face is turned away from the user.
The use of an American designation model number and a black background meter face may have been informed by the large export sales from Britain back to the USA.
The Weston Master IV and subsequent models used a redesigned and efficient Invercone for incident light measurements. This was made out of fragile perspex and had a tendency to flick off the meter if the baffle were released from its body lock while the Invercone was mounted. Many fractured and broke as a result.