Buckstix, unless you are getting into this gun very reasonably, I would do your best to get the seller to agree to a three day inspection period. That way, you could shoot it over the weekend and get a better idea of what you are dealing with. A double that won't regulate can be a very frustrating exercise and being your first, could put you off doubles completely.
One positive is that the 9.3X74R is not too different from the original 360 ballistically. You may find that the Fraser is bored for a slightly bigger bullet than the .366" bullet of the 9.3. Maybe .368" but I am not sure if this will have much effect in shooting it.

Take a good look at the bores. That is one area that can hurt value - bad bores.
Fraser made doubles in different grades and on different actions as 500Nitro says and yes, Daniel Fraser rifles in best grade are as good as any so if bought right, you probably aren't going out on a limb too badly.
A Fraser in 9.3X74R would be a very usable rifle here in the states.
Good luck! Keep us posted.