Very interesting stuff, can't believe that no one has chipped in here!
It sounds as if the factory closed up in 1931, so the bike would not be older than that.
http://www.theswiftclub.co.uk/register.html
(they'd like you to register your cycle, too
)
East Hill
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TRY EMPATHY & HAVE LOVE IN YOUR HEART, PERHAPS I'LL SEE YOU ON THE ROAD...