That is a metric thermometer used by the Navy made by or donated by the company Jintan. It says flat type on the box lid. Jintan is a company known for its silver pellet-shaped herb pills that work like mint to give you good breath.
仁丹
Jintan
They do wake up your mouth!!
-- Guy
How many pellets do you take each time? How many times a day? Jintan is supposedly good for many things.
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