The backside arch is kinda a Manitou thing, but I'm not a big expert. Not sure when they started doing that. My Guess would be early 2000's? It's QR, has canti bosses, but post mount disc.
I think there were a few other brands of reverse arch forks, but Manitou is the most known.
OK, dug around some,i think its around a 2003 Manitou Axel or Six
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