Help with identifying a British Lightweight frame

[brilleaux]

Hello! Could anyone help with identifying these frame and forks? I guess they are from the late 60s to mid 70s? Claud Butlers from that era seem to have very simlar design and components (Prugnat DS etc), but I couldn't find any models with the curved brake-stop bridge as on this one. The head tube has holes drilled for a head badge in the sort of position a Claud Butler badge would use. The bottom bracket has a serial stamped "158065" and the original colour appears to be a metallic brown going on the fork steerer.

 

[mdvineng]

Pictures would help enormously

 

[brilleaux]

Pictures would help enormously

Sorry, had trouble uploading pics. Hopefully you can see them now!

 

[chickendrumsticks]

Frame no rings a Viking bell. Their Severn Valley had a curved brake bridge. Check out "classic vikings" site.

 

[Old Ned]

I think Severn Valley frames were Nervex Pro lugs but I suppose other lugs may have been used.

 

[chickendrumsticks]

"The Severn Valley appears to have dropped out of the catalogue for 1956 and then reappeared in 1957, replacing the Tour of Britain as the top model while acquiring Nervex Professional lugs."
This from Classic Viking site. So could be an early one maybe. ..