6x30 Dienstglas 'cxn' + rubber cover
A very nice mid-war example of the 6x30 Dienstglas, clearly maker coded 'cxn' for Emil Busch AG, Optische Industrie, Rathenow. They also display a blue lubricant circle marking to denote suitability for use in cold environments.
This particular pair comes fitted with the original leather neck strap and black rubber ocular guard, as shown. The optics remain very clear, with smooth focussing on both sides. A great set for display or use!