This one may be pre-owned, but its original owner has kept in in immaculate condition over the years!
The Patrick Eggle Berlin Pro is a guitar designed by Patrick Eggle, a luthier from the UK, in the early '90's. It is a continuance of his earlier work, the Patrick Eggle Climaxe. The Patrick Eggle Berlin Pro is very similar to the PRS Custom and it is even said that Patrick Eggle based the guitar on the PRS. The scale of the neck for instance is also 25 inch.
You can read more about Patrick Eggle and his fine guitars here, but you'd be hard pressed to find an early model of his in such great condition and at this price!