[PaulR]

Thank you Jerry, they are very interesting. I once saw a similar set in a junk shop but it had long oval speaker cutouts. I think there may have been a just post war TV set with a similar cabinet.

I think I was mistaken in thinking that my 135 with the concave back corners was the later one. As has been mentioned before, the 137 and now the 138 are pictured with square corners whereas the 135 shown has the concave ones. My 365 radiogram also has square corners. Presumably the 135 with the square corners was produced just before the 137 came out and the cabinet modifications had already been made.