Color and markings: Gray over all with green and brown nose band and white tail struts.

General description: These two bombs were designed to fill the great need of the Ja-panese Navy for armor-piercing bombs. Prior to the design of these two, the Japanese Navy had only one true armor-piercing bomb, the type 99 No. 80 Mk 5, an adaptaton of a large caliber artillery shell produced by turning the shell down to a streamlined shape and adding a tail section and a slightly larger explosive charge. Type 2 No. 80 Mk 5 and No. 150 Mk 5, although they were specifically designed as armor-piercing bombs, differ only slightly from the earlier bomb. Type 2 No. 80 Mk 5 differs from type 99 No. 80 Mk 5 only in having a slightly larger explosive charge, and in having no recesses at the nose to hold a windshield in place. No. 150 Mk 5 is simply a larger version of type 2 No. 80 Mk 5. Both bombs of the No. 80 size use two B-2 (b) fuzes in the tail with the special Mk 5 gaine. No. 150 Mk 5 has two large fuzes of similar construction to the B-2 (b).

These bombs were never extensively produced, and neither type 2 No. 80 Mk 5 or No. 150 Mk 5 was ever outside the Japanese homeland.

The data on these bombs is the result of incomplete investigation, and must not be con-sidered as specific, accurate information.

The Mk 7 bomb was never more than an idea as far as the Japanese Navy was concer-ned. It was suggested and discussed by a meeting of designers in 1935, but no experi-ments were carried out because the idea was considered impractical and unnecessary. The bomb, as planned, was to consist of the 1 kilogram practice bomb, with a conical glass bottle of bacillus culture in place of the smoke mixture in the tail. A lengthened striker was to break the bottle, and the culture was to be spread by the force of impact. A spread of 1 meter diameter was ho-ped for. No specific type of bacillus had been se-lected for the bomb.

Distinctive color markings for the bomb was to have been purple painted nose and tail.