I'm a big fan of heritage breeds. We had Plymouth Barred Rocks when I was little and I have a Golden Spangled Hamburg and had, until a recent break in by a couple of stray dogs, a beautiful Silver Laced Wyandotte. She had such personality (as does my Hamburg) and my children and I were heartbroken when we lost her. I don't raise for meat, just eggs and gorgeous looking pest control. I wasn't even keen on having another rooster; my last one was awful to my girls but that was a cockerel and this one is far more mature and very sweet. His last keepers had him for 2 years and he was fully mature when they got him so he's at least 3 years.
When I first saw him, I immediately thought BR mix but I was thrown by the brown barring. Someone had mentioned Golden Cuckoo Marans and though he's much darker than many, I've been seeing some photos that are much closer to his coloring. He also resembles the Birchen Marans a bit except for all the barring. He does have quite a bit of gold coloring in his hackle and saddle feathers but it's difficult to see in the photos and it's more cream than white the way it appears. I don't know if that helps narrow it down any more.