Hi , now something not Japanese but very interesting, museum piece, namely militarny Helvetia pilot watch from WW II. Watch dated 1939, produced for pilots, next to B Uhrs given by Luftwaffe also in use by pilots during WWII, Konrad Knirim mentiones about this watch in his " Bible od military watches" i attached scan from his book. Big watch 41mm in original condition, with thick crystal with scratches ( i ketp scratches as scares) original dial, hands. Case with 2 x backs outer and anti dust. Watch after full service working Perfect. Additionally hand made strap. I think IT is great piece for collection. If any interest pls PM, thank you. Shopping worldwide possible 35usd. In below posts some photos I can send more photos on priv.