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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.
Thanks @midlife.
Your guess is correct - According to velobase, the calipers were made from 1948.