I had a closer look at the side of the box where original markings should be and lo and behold, they are still visible under the postwar paint. Three lines as per the photo Bruce M posted. No sign of the "YA Line" at the very top. Also noticed Northern Electric also made the headphone assemblies (two metal head band style) and the Buzzer Mk. F pieces as well.
Both units were made in 1943, about 100 numbers apart in Serial Numbers, but the schematic plates inside the back of the boxes are different. Looks like more than one manufacturer may have been involved in the manufacture of the wooden cases.
David
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