Original Item: Only One Available. This is a very nice 1960s Era tear gas canister grenade, with an aluminum body and 1-SEC marked fuse. This meant that the canister would begin to discharge while still in flight from the launcher. Post War Japan received military and police supplies almost exclusively during the 1950s, so this type of grenade is expected. The design is virtually identical to those still in use today.

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The label on the canister appears to be Pro-Communist Propaganda, most likely from the Japanese Communist Party (日本共産党, Nihon Kyōsan-tō, abbr. JCP). Originally founded in 1922, it is still in existence today, and is one of the largest non-governing communist parties in the world. The use of a symbol of government oppression would definitely make a great display piece for members.

Very interesting, and definitely ready for some further research!

The Anpo protests, also known as the Anpo struggle (安保闘争, Anpo tōsō) in Japanese, were a series of massive protests throughout Japan from 1959 to 1960, and again in 1970, against the United States–Japan Security Treaty, which is the treaty that allows the United States to maintain military bases on Japanese soil. The name of the protests comes from the Japanese term for "Security Treaty," which is Anzen Hoshō Jōyaku (安全保障条約), or just Anpo (安保) for short.

The protests in 1959 and 1960 were staged in opposition to a 1960 revision of the original 1952 Security Treaty, and eventually grew to become the largest popular protests in Japan's modern era. At the climax of the protests in June 1960, hundreds of thousands of protestors surrounded Japan's National Diet building in Tokyo on nearly a daily basis, and large protests took place in other cities and towns all across Japan.

On June 15, protestors smashed their way into the Diet compound itself, leading to a violent clash with police in which a female Tokyo University student, Michiko Kanba, was killed. In the aftermath of this incident, a planned visit to Japan by US president Dwight D. Eisenhower was cancelled, and conservative prime minister Nobusuke Kishi was forced to resign.

A second round of protests occurred in 1970, at the time of the 1960 treaty's automatic renewal. Although shorter in duration, these later protests also achieved significant size.