20x120mm Japanese Navy Type 97 Submarine Binoculars

These Type 97 Binoculars were used on Japanese late-war submarines such as I-14, I-401 and I-400. They were made by "Nippon Gogaku"and are pressure proof up to 330 feet under water.

I took references from this site https://astromart.com/classifieds/astromart-classifieds/binoculars/show/ww2-20x120-nikon-submarine-radar-bioculars

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