Gollum-

You're going to need to put some photos up of the actual gun.
As with most guns, this will be a case of 'buying the gun, not the gunmaker' and condition will have the most effect on value.
Still, you should negotiate an inspection period where you can have the gun in-your-hands for some days, with the understanding that if it's not up to your standard of condition you can return it for a refund.

Let's see the photos.

Cheers
Tinker