I have no knowledge about these aside from the fact, that Ive always liked the style of the 'compact' bottom cap.
The visor is in exceptional condition, can you show a close up of the buttons, are you sure they are not a type of plastic?
I asked a friend a favour and had the label translated, it's related to the goverment contract.
Government bond number--13-420
Assessment number--------West 101802
Manufacturer Cost----------33.06 yen
Sales Price------------------38.80 yen
Shipping Cost---------------more than 5 yen...Cannot add fares...4.03 yen
Nothing specific on the ceramic buttons, cermaic buttons were used on clothes and are collectable in themselves, I find it difficult to believe that they are an economy measure, the rest of the cap looks far to good for that, I understand that 38yen at that time was expensive, so I would think this is a high ranking officer cap, that is just my assumption.
I think you have top quality cap.
I really appreciate the info Tinhat. Thank your friend as well.