Oops, I always mess this one up and call it a WilSON & Gibbs.
Restoring some of these old machines might not be as difficult as you think - if you join the treadleon mailing list, you'll find a lot of help for getting yours fixed up.
As long as it doesn't require some obscure needle that isn't available anywhere, you could be back in business pretty fast. Lots of people have these chainstitchers - the treadleon list has had swaps of redwork blocks done on people-powered machines like yours. :)