I have an old built on back violin, very thin, without purfling and with linen linings to the ribs and also as corner reinforcements (instead of blocks). It's been repaired and altered so many times - I call it my "frankenviolin" The top has been patched in places with a veneer, and the back has a long recently cleated repair.
The neck is a through neck, possibly an early 19th century addition as it isn't a precise fit and is made in a more elegant style. It is "full length" (albeit slim), whereas the violin is only 7/8. The pegholes were bushed, possibly later 19th century as there is a repair label from that time.
Is there any good way to know whether this would be earlier or later built on back? I don't know if the linen strips are any help in identifying. The corner linen is not the same type as the ribs so could have been added at a different time (or then again maybe not). Can provide pics if anyone is interested.