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@Quiet_Mike
Very satisfying taking these beauties apart. They had suffered no abuse and just needed a good scrub with fine wire wool and whatever metal cleaner I could lay my hands on, then a polish with a soft cloth and Brasso. All the nuts and bolts came undone easily. Old red Fibrax blocks in aluminium clamps looked period to the bike as well.
I think these GB Hiduminium brakes were introduced in 1948? And I guessed used up until the early 50's.
GB Hiduminium brake levers by zombikombi1959, on Flickr
Front and rear Hiduminuim brakes by zombikombi1959, on Flickr
GB Hiduminium dissected by zombikombi1959, on Flickr
GB Hiduminium brake caliper by zombikombi1959, on Flickr