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Thanks @midlife.
Your guess is correct - According to velobase, the calipers were made from 1948.
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Velobase is a little out.
Classic Lightweights has an advertisement for the brakes in 1945. I have a set on my September 1946 Hobbs of Barbican. The front stirrup arm is stamped with the common Hiduminium, and the rear has no Hiduminium stamping. This would indicate the approximate date for the adoption of the stamping.
Blimey I remember those brakes lol. I worked in a bike shop in the 70's as a teenager and really old people (younger than me now) brought bikes in with these. I guess they are just after the war
Do your blocks look like compressed leather? They were popular with steel rims BITD. I wonder what modern pads are good with steel rims?
Cracking bike by the way :)