Any info on this Business 5 mechanical pencil?

General Mechanical Pencil Discussion
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So I randomly found this on Mercari

The ‘‘5’’ I’m guessing refers to 0.5mm? But I have actually never heard of ‘‘Business’’ as a writing instrument brand.

For a 200-yen pencil to have their own box and manual, 200 yen must be a lot of money when it was released, hence I’m guessing it was from the 60s? Or maybe it was just a cheap brand idk

Just curious if someone knows more about this particular pencil or the brand

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This is a pencil by the brand ‘JUNIOR’, a lower tier manufacturer from the 1970s and 1980s. Their best known model is the ‘HARD3’ which tries to imitate the style of the Pentel PMG. In general, they are mechanically interesting, unusually complex, and they may not be the smoothest in operation. Here’s an old tweet with some pix of their internals.

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