I recently purchased a 1992 Ruger Super Blackhawk Hunter 44 Rem Mag pistol. It included a Nikon scope (the one pictured), 2x20. I would like to find more information on it. Maybe a copy of the owner's manual and specs. My first place I looked was Nikon's website. I ended up calling them, but their contact said he couldn't find any info based on the serial number. It is a Japan made scope. The serial number is 403987. Any info is much appreciated.