i have had this badge for many years,,the vet who sold it to me said that it came from the Sasebo Naval Air Base,,,it is aluminum with the number 78,,is this a worker's id badge or something else?..anyone have any thoughts on this?.rare or common,,,value if any?...thanks,,Robert

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I'd lean towards factory workers badge. What factory is the question. I don't recognize the logo/design of badge.

One of their areoplane factories would be my guess