List of Japanese military equipment of World War II - Wikipedia. https://en.wikipedia.org/wiki/Type_21_light_machine_gun
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Maybe its just a typo that was left in? Since its easy to fat finger a 1 instead of a 2, hence it was meant to be Type 11 and accidentally became Type 21.
it’s a mistake, however in this post they are a few machine guns who could suit: Japanese unique gold order / premium weapon suggestion
It’s Wikipedia, my dear. Trusting the information on that platform is like trusting a blind person to tell you “look at this.” Do you understand the irony?