Do your homework.
I have a matchlock that my dad got in Japan after WWII. He was under the impression, at that time, that the gun was 300 years old. I showed it to someone a few years ago, and he was certain it was a modern - as in '80s-'90s - "replica".
It might not be 350 years old, but I'm absolutely certain it's not 35 years old!
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