Hello Welcome to the Forums. Do you have any other pics? maybe of the complete frame? I think it is a old British bike from the 40s or 50s but I am no expert it could be a copycat.
I am sure the 3speeders will chime in soon. it is a threespeed with rod operated brakes right?
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk