There is a possibility that although it is a Fraser designed action, it was only finished off by the Fraser Company.
Webley also produced these actions and it may well be that rough machined parts were provided by Webley to Fraser for final finishing. After all, Webley had the manufacturing capacity and a very large workforce, whereas Fraser employed only a dozen or so artizans.
Like many 'Named' British gunmakers, not all of them actually made the weapons they sold, from scratch, but simply bought in actions and components to assemble, finish, barrel and stock.
A restoration would be an ideal project for anyone with the skills or the money (in these times of economic hardship)to finance the venture.
Best ask the vendor what he wants, and then try and talk him down a bit, haggle over the price, point out it will cost a fortune to restore, etc. You wouldn't have to do a restoration all at once, just a bit here, and a bit there, until it's finished.
Harry