It's interesting that, in the other Clock thread, Frank has said the clock mechanism seems to date from 1930s to 50s. The face on this blue glass example is slightly different from the green glass one and it has no "Trade Mark" wording on the face. But they both have a 1930s look to them. As do the glass surrounds, even though the colours are not what I would associate with that period.
The clock faces and the rounded metal surround, as well as the mechanism that Pamela showed, all seem to be in very good condition.
Looks to me like fully modern work in a version of a 1930s style.