po1—Coastal Defence ,,Kriegsmarine 8×60 Binoculars By Zeiss.

A very rare set of coastal Naval sea defence artillery binoculars for zone Lettland which are magnification 8 x 60 that have the T for coated optics and the H marking for high light transmission, Helligkeit. has the N for North Sea Station plus the prisms are giving good clear vison with no chips including the hairline vertical line. also very rare are the cartridge side fitting cylinder that reduces fogging and condensation plus lights up the vison  .this would be a special request to Zeiss . this may explain the 530 number which is an area code diets Norway 10th Naval artillery ,, I am still researching this item for the moment.