To me it looks unused, mostly unused, and contemporary. Maybe a mix of some old parts. Maybe an old barrel.
There's no percussion flash burn on the wood or iron, so use would be minimal at best. And wouldn't be the first new gun to have a wood repair on it, for one reason or another.
It's a nice looking rifle, and if the price is somewhat close to a new gun price, I'd buy it, if that was what I was looking for.
If it's being sold as an original, for sure a gun in hand inspection.
John