ZF 10x80 Flak 88mm 18-36-37 sight 'cxn'

An incredibly rare, complete and fully original example of the ZF 10x80 monocular - as attached to the infamous 88mm Flak cannon, for use when acquiring ground targets as a line-of-sight scope - that was produced, uniquely, by Emil Busch Rathenow under the 'cxn' maker code. 
 
This particular one comes exactly as it was found, complete with all of the associated and matching accessories; including the iron sights, sunshade (correct short style - NOT the same as from a D.F10x80 Flak binocular), dual rubber eyecups (one with dummy blank eyepiece), and headrest brow pad.
 
Indeed even the side-mounting bracket, with which to attach the scope to the cannon, is still present! 
 
Optically the sight remains in a usable state. There is what appears to be some delamination to the internal reticule plate, yet this remains intact and still fully visible inside. Sun filter and focal adjustments are also still fully functional. 

An exceptionally rare opportunity to obtain a properly complete example of this optical sight - the very first, and quite likely only, example of this type that we will ever have to offer in this condition!