I can't tell if its bio or patent the inside of the loop on the second third photo looks like patent since its lite in color, but the over all look it looks like bio, but that doesn't have a lighter color on the back side.
Is the hardware SS? Which it probably is, what I can see is looks like a well made harness. Cheap harnesss don't usually have a 3 strap breeching.
You can find a new plain harness for 400. If its spotted and SS like it looks like if you can get it for 450 (if its bio I don't know much about patent leather)
A new bio with fancy spotting and a 3 strap breeching and SS hardware and hames will cost around 750.00.
It looks like its a pretty show harness.
I don't know much about patent leather, but I do know that I wont give up my bio for leather. I can hose my bio off and let it hang dry and go on. Leather has to be conditioned every so often.
I would ask where the harness was purchased or made before I passed up on it.
The bridle looks like it has SS hardware with show chains, which purchased new will cost over a 100 alone.
If your looking for something to play around with at home, it might be to flashy, but if your going to take it out to town, what a harness to have.
All the prices I'm referring to are for draft size, so if its horse size, sorry disreguard everything I have said.