Translation help on Dial Face Please?

[beretta1934]

I don't think it piece is military - but who knows. Could be from a faucet handle for hot and cold water for all I know Would appreciate any help to understand this item better

[GHP]

I have no idea .... but

高空調整
Kōkū chōsei kōkōdo
High altitude adjustment

調整: adjustment; regulation; coordination; reconciliation; tuning; fixing; tailoring

薄 / 濃
usu/ ko
Thin/Thick
Diluted / Concentrated


-- Guy

[beretta1934]

Thanks Guy! That is a puzzling one