Phil, it's almost certainly a copy of a Strad model, which doesn't mean anything. Some of the Strad copies are excellent and others are, well, not. Some are old, some new. And like all musical instruments, they are worth whatever someone is willing to pay for it.

If you are looking to sell, you could pay to have it appraised. Any offer a resale shop gives you is likely to be about half of what they will sell it for, but they will probably set it up properly and restore it if it's worth much.

The cruicial question is: How does it sound? I'm in the market for a new fiddle :)