That looks to be a better than average British gun in better than average condition. Looks to be unmolested, undamaged.
Assuming that the bores are in fine condition, shootable without worries, it would certainly be worth acquiring.
Is this a make an offer situation, or does the seller have a price in mind?
If I walked past it on a table at a show, and it wasn't over $500, I would certainly stop for a second look.