HPM is another well known vintage hallmark that you don’t see a lot of anymore. The company operated out of Seattle, WA in the 1970s. Not a lot of information available, unfortunately. These are typically found in 10 oz class. The 1 and 5 oz varieties are extremely scarce.
Here are a few more great examples that Brian R. shared for this post, including a first gen 10 oz class HPM. Very cool.
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