Hello, well I promised I would be back tomorrow but as I was sitting down to read some of the posts, I realized that I had a gondola sitting right on my desk from some earlier investigations. It is a Hornby, Type 20. In 1954, Hornby announced that the M0 line of trains, Hornby's bottom or least expensive line since 1930 was being replaced by the Type 20. The loco was handsome and the tender reflected the "Lion & Wheel" emblem of the nationalized lines. It is sad to note that interest in Gauge 0 was clearly declining by this point and this Type 20 was one of Hornby's last gasps into new trains in 0 gauge. By the early 1960's almost everything had moved to double 0 . But, here she is, the Hornby type 20 gondola, available from 1954 to 1966. This was always a small line, this gondola is but 4" long and the couplers are simple hook and open circle both actually made as part of the floor or frame.
Best wishes
Don
