Hamilton Mint issued a set of medals to commemorate events related the Japanese bombing of Pearl Harbor on Dec 7, 1941. They were made in both silver and gold-plated editions. Although the actual number minted is unknown, most Hamilton Mint sets seem to have an edition limit of 5000.

I have three of these, and this is one of them:

U.S.S. Honolulu CL-48

U.S.S. Honolulu CL-48 was launched in 1937 and commissioned in 1938. The ship served in the Battle of Tassafaronga, the Battle of Kula Gulf, the Battle of Kolombangara and the Battle of Peleliu. She was taken out of action by serious torpedo damage just before the Battle of Leyte Gulf. She was repaired, but not in time to rejoin the war. She was decommissioned in 1947 and was held in reserve until she was scrapped in 1959.

The vintage silver round depicts Honolulu as it steams out the rocky high waters of the ocean.

The markings on the smooth edge of the silver round indicate the purity of the silver round, which is.999 fine silver. Other markings include C for Commemorative, HM for the manufacturer, Hamilton Mint, and P for type of finish, which is proof. Also etched in the edges of the silver round is its number, which is 0664.

In the 1970s, Hamilton Mint, like Franklin Mint and Danbury Mint, was a major producer of silver. Most of what it produced was in the form of rounds or sets of bars, most of which were bars. Additionally, a lot of the sets had gold plating applied to them. Whereas Hamilton Mint utilizes .999 Fine Silver, Franklin Mint mostly manufactures sterling silver goods. All of the products from Hamilton Mint were "proof-like".

The sizes of the rounds that Hamilton Mint produced varied. There were rounds that weighed less than one Troy ounce and others that weighed 2.1 Troy ounces. They, of course, manufacture one-ounce rounds. Many of these were commemorative issues. The Hamilton Mint's oldest issues appear to be dated 1970, while the newest ones come from 1978.

Even though the company has been producing unique silver art bars and rounds for almost ten years, not much is known about it.

I purchased these vintage rounds many months ago last year using my HBD. I am lucky to have these specific rounds, as they represent the places where I have live my life (so far). Thank you @stokjockey .

Reference
https://en.wikipedia.org/wiki/Attack_on_Pearl_Harbor
https://en.wikipedia.org/wiki/USS_Honolulu_(CL-48)
https://agroundworld.com/pshop/hamilton-mint-silver-rounds-158

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