Is it 20s or 30s?
Honestly I am not quite sure, it's almost identical to another 1922 frame online. There's little others to compare with though
I had always thought Granby was based in New Cross, this advert doesn't mention New Cross.
A few pages of the 1928 catalogue (Courtesy of VCC library) show details of the forks like your one -
1922 catalogue, Courtesy of VCC library
Catalogue cont
And finally
@Nbenja3 started
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Is it 20s or 30s?