Zeiss 7x50 Kriegsmarine Artl. binoculars 'blc'

A very nice, totally honest 'been there' example of the mid to late-war Kriegsmarine issue Zeiss 7x50 'gas ocular' binoculars - designed to be used in conjunction with a gas mask, if needed. 
 
Yet, that is where the usual normalities cease with this pair... These are a set which are one of a few binoculars that we have both personally collected / observed over many years that have at some stage been wartime factory-refurbished, almost certainly by Zeiss, for issue to KM Artillerie forces. 
 
This encapsulates the addition of the Zeiss-style eagle and 'Artl.' designation, as shown. 
 
Other binoculars observed with this exact same refurbishment and applied markings have mainly included further examples of Zeiss' own production optics; but also a Leitz Wetzlar 'beh' 7x50 - plus a couple of coated lens, roof prism 7x56 & 10x50 variants from Hensoldt Wetzlar 'bmj'.
 
The optics on this pair still function to produce a superb bright and sharp image - and most notably include the KM artillery crosshair rangefinding reticule visible within the right-hand side! 
 
A very rare surviving example of this variant which would be a highlight within any Kriegsmarine or optics related collection!