You're the (proud, no doubt) owner of thé most iconic microscope ever made in continental Europe: the Zeiss Winkel Standard GF, also known as the "Zeiss Oberkochen Standard GF", from the German town were these stands were build.
It's commonly known as the "Zeiss (Standard) GFL" as well, with "L" ("Leuchte") meaning build in 6V - 15W illumination.
This line of Zeiss microscopes was produced between midst the 1950's up to the late 1960's, when they were replaced by the well known grey and beige Zeiss Standards RA, 14, 16, 18, 20.
There were at the time three versions of this stand: the Standard G, the Standard GF and the Standard K.
The "G" (from "Grösstrieb", coarse focussing mechanism) only had a coarse focussing knob, the "GF" (from "Grösstrieb-Feintrieb") had a coaxial coarse-fine focussing system like yours, the "K" had a combined coarse-fine focussing system, pretty much as the one used in another popular stand of around that era: the Leitz "SM" ("SchülerMikroskop").
Over the years, some variants appeared: with/without removable nosepiece and such.
The GF was at the time the smallest Zeiss stand, designed for heavy profesional use. It was expensive (think a few average monthly wages).
The G was intended to be used by demanding amateur microscopists and schools, serving more or less the needs of the same audience that would have bought their entry level stand: the "Zeiss Standard Junior K(F)".
Further up the line up was the rather heavy and large "Standard WL", followed by a real beast that left absolutely nothing to desire: the "Photomikroskop" and the even huger monster: the "Ultraphot".
I own a GF as well. It's a great microscope and they can, sometimes, when one is lucky, be bougt very cheap, at least in the monocular version. It's all one hopes for in a microscope: heavy, sturdy, reliable, superb optics.
Probably interesting for you to know: the GF was designed to be used as a real "platform": nearly all parts from Zeiss can be used on your stand.
At that time (things have changed since then...) Zeiss took "backward compatibility" very seriously: most parts of the later grey and beige Standards can be used on the GF as well.
Advice: treat it well. And literally: carry it as a baby. The focussing controls move the limb and the tube, contrary to later designs where the focussing controls move the stage. Always one hand on the limb, the other hand supporting the foot.
I noticed in the first picture that yours is equipped with the N.A. 1.3 condenser. This is a very well corrected, high grade system, worth in itself quite some money as it is in high demand, these days.
The condenser with which the microsope was equipped in the basic version had a removable lens at the back, intended to enlarge the cone of light to provide illumination of the entire FOV at low magnifications.
The upper lens of the condenser swinged in/out trough a lever underneath the condenser. These original condensers are in high demand as well.
Edited by Microscopy, 30 August 2017 - 10:09 AM.