I’ve got this Schmidt and bender pmii scope on a gun of mine. It is a 3-12x50 with a reticle that has a illuminated cross in the middle that is floating with mil dots and hash marks in the reticle but no ranging lines on the bottom like what is in a p4. I’m looking for any info such as when this scope was offered, what kind of reticle it is, and why the Illumination knob is on the left turret and not the more prolific model rheostat. It also has an angle cosine indicator and another device that I have no idea what it is? Thanks!!!!