This is a trigonometrical station built by the Japanese in WWII, with words '3rd level trigonometrical station' carved on one side.
Today, the trigonometrical stations in Taiwan and Japan are still in the same specification with this.
Date picture taken
unknown
Comments
Japanese trigonometrical station
That's an interesting piece of history. Have you found any written records about when these were set up, and if there are more of them?
Regards, David