The Serial number of 126352 and combined Carl Zeiss Jena name of the scope indicates this is a early production post WW2 scope from what I can find out "googling".
S/N's up to around 80,000-90,000 tended to be military production.
Short;y after WW2, I believe Zeiss stopped the use of the Zeiss Jena combined name with an injunction as the Jena factory was no longer part of the Zeiss empire.
It subsequently became JenaOptic and then Docter.
*Crystal clear glass and is bright from edge to edge as expected from Zeiss
*Some superficial marks on the tube but to be expected on a scope of this age.
*Turrets rotate smoothly without grinding
*Patented Zeiss rail mounts eliminate poor fitting rings associated with other vintage scope, hence no ring marks.
*I have managed to source some rail mounts for the scope side (ring equivalents) but bases will be dependant on rifle fitment. Parker Hale and Mauser type action bases are more commonly found second hand, as are Blaser. I will list the mounts when I get them but any Zeiss rail mount including the Weaver/Rail mounts found in many US gunshop sites will work.
Would suit a vintage or period rifle or any stalking rifle where quick target acquisition and heavy post reticule for low light is required.