Inscription on the Rim

The cup with the aircraft engraving bears the inscription, clockwise:

「川／西／大／型／飛／行／艇／竣／成／記／念」

Romanized: Kawanishi Ōgata Hikōtei Shunsei Kinen

Translation: Commemoration of the Completion of the Kawanishi Large Flying Boat (H8K).

The other red lacquer cup bears the “Go-shichi no Kiri” (Paulownia Crest) in gold. This is not the Imperial chrysanthemum crest, but rather the paulownia crest widely used by the Japanese government, ministries, and corporations. Historically associated with the Toyotomi clan, it later became an official emblem for state use. Such designs were often chosen for commemorative and ceremonial items related to state or industrial achievements.

5W1H: What You Need to Know About the Kawanishi H8K (Emily)

What｜What is it?

The Kawanishi H8K, codenamed Emily by the Allies, was a four-engine flying boat of the Imperial Japanese Navy. Widely considered the most advanced long-range seaplane of WWII, it combined exceptional endurance, heavy defensive armament, and outstanding ocean-going performance.

Who｜Who built it?

Designed and built by Kawanishi Aircraft (later ShinMaywa) in Hyōgo Prefecture. Powered by Mitsubishi “Kasei” engines. Operated exclusively by the Imperial Japanese Navy.

When｜When was it made?

The prototype’s maiden flight took place in 1941 (Shōwa 16). Mass production began in 1942. The inscription “Commemoration of Completion” suggests these cups were issued at ceremonies celebrating the prototype’s completion and first flight.

Where｜Where was it used?

Built at Kawanishi’s factories in the Hanshin region. Deployed across the Pacific, including bases in the South Seas, Southeast Asia, and Central Pacific.

Why｜Why is it significant?

• Served in long-range reconnaissance, patrol, and anti-ship missions.
• Featured intercontinental range, excellent rough-sea takeoff/landing ability, and robust armament.
• Famously conducted long-range missions early in the Pacific War, including reconnaissance and raids near Hawaii.

How｜How was it designed?

All-metal construction, four engines, boat-shaped hull for open-sea operations. Designed with self-sealing fuel tanks, armor, and multiple gun turrets—earning a reputation as the most formidable flying boat of its era.

The Special Role of Sake Cups in the Japanese Military

In the Japanese military, commemorative sake cups were more than souvenirs. They symbolized loyalty, camaraderie, and shared sacrifice. Cups were distributed at milestones—deployment send-offs, promotions, ship launchings, and aircraft completions. Sharing a drink from these cups reinforced bonds within units and between service members and their supporters.

Thus, these cups carry not only military-historical but also cultural significance, representing how the Japanese military ritualized loyalty and achievement.

Japanese Lacquerware Tradition

These commemorative cups are crafted with Japanese urushi lacquer, world-renowned for its brilliance, durability, and artistry. Known as “Japan” in the West, lacquerware has been admired for centuries for its resistance to water, longevity, and deep gloss.

The red lacquer and gold detailing seen here are a hallmark of high-quality Japanese craftsmanship. Even after 80 years, the cups retain their striking color and fine engraving—a testament to the enduring strength of traditional lacquer techniques.

Item Highlights

• One cup with engraved H8K flying boat and commemorative inscription.
• One cup with paulownia crest (Go-shichi no Kiri), used in government and corporate ceremonies.
• Preserved together as a historical pair of commemorative cups.
• Ideal for collectors of aviation history, military memorabilia, or Japanese decorative arts.

Condition

• Minor wear and small marks consistent with age.
• Gold rim and engraved decoration remain well-preserved and clear.
• Please refer to photos for exact measurements (approximately palm-sized).

Keywords

Kawanishi Aircraft / H8K / Emily / Imperial Japanese Navy / 1941 / Prototype Completion / Military Sake Cup / Paulownia Crest / WWII Aviation / Japanese Lacquerware / Prewar Industrial Design

Summary

One cup celebrates the completion of the Kawanishi H8K flying boat, one of the greatest seaplanes of WWII. The other bears the paulownia crest, symbolizing government and corporate commemoration. Together, they embody a unique intersection of technology, propaganda, and traditional Japanese craftsmanship.

A rare opportunity to own historical artifacts that tell the story of Japanese aviation, wartime culture, and lacquer artistry.