Or it was built for the metro market. Some city folks like the sights on the side of the gun rather than on the top.Probably a barrel blank that was left in inventory when Remington took over Marlin. Most likely the Remington employees got the sights misaligned when they did the remaining work to install the sights. Just my guess.
Seriously, hyphenated hit the nail on the head. The old Marlin wasn't perfect either but the current manufacturing group has had an inordinate amount of problems since the move to Ilion.