6x30 Dienstglas 'Busch Rathenow' factory refurb binoculars

A very rare and desirable early example of the 6x30 Dienstglas field binoculars, produced by Busch Rathenow.
 
They are a pair which have clearly been refurbished by the Busch factory themselves during the war; having undergone an update to the 'cxn' maker code (& '+' lubrication marking) in the process.
 
Interestingly, the previous early Busch Rathenow maker's logo can still be seen on the left-hand prism plate - as well as the serial number etc on the right-hand side - when under the right lighting, as shown. 
 
Optically requiring a full cleaning/service if desired. The Strichplatte range finding reticule remains intact inside. 
 
A really super example of a 6x30 Dienstglas binocular, and one that would surely be unique within even the most advanced optical equipment collections!