Japan Tourist pins.., 1950's.., backs have pin fastener as in the one example, except for those shown with a screw-on mount.

Pin descriptions (based on Google translator, may or may not be accurate and/or a complete translation)::

1) Oku-Musashi Takayame Observatory

2) Kuroyama Mitaki Falls

3) Mt. Mitake, 1,070 Yen (Okutama)

4) Akigawa Valley

5) Lake Kawaguchi

6) Cannot translate...

7) Okuchichibu Mountain Range

8) Mt. Myogi

9) National City

10) Mt. Takao National Park

11) Izu

12) Wind

13) Tokyo

14) Nerima

Thanks for looking!