I thought it wasn't a bob but only restored by them?
could well be gas-pipe!
from the ebay listing...
it is a bob jackson. it looks like other bob jacksons, but more importantly, hilary stone says it's a bob jackson and i bought it from him. i tend to trust hilary's judgement because he's the bona fide marque enthusiast for most british framebuilders, has a long history in the industry, and i've been round his house.
from the ebay listing...