Here you go, this watch listed in early model and military watches section of Museum of Japanese made watches book. I really want to get that book in a reasonable price. About this model, this one looks like Longines Tre Tacche, it purposely made for military officer back in the 1940. Some says that this model is a post-war model, but as we know information about this watch is minimal. Have dug through old archive of old SCWF, it said: "1939 - 1945: WWII era, MILITARY models: SEIKOSHA Precision 1939 - salient features: double case, bold numerals on the dial, thick hands. In 1940, a center second model (reputed as the 1st of it's type for a Japanese watch - but maybe NOT a native Japanese design, see the Super ca. 1950), based on a Morris 10 Type (?) 15-jeweled movement, was introduced. I believe this is the same watch that other sources have called "Japan's first 3-hand watch". Versions were made for each branch of the service (different dial logos such as anchor, star, and cherry blossom). The cherry blossom model is speculated by some to have been for the "air force". However, those who know something of Japanese WWII military history know that there was an Army air "arm" and a Naval air "arm" (some carrier based, but others land based), but no unified "air force" - similar to the US in those days. The "Shimpu squadrons" [which many of us know as the "Kamikazes" - suicide mission craft] of the Naval air arm are the logical choice IF this assertion is correct. The suicide pilots often were compared to "cherry blossoms" due to their ephemeral nature, beautiful creations which soon pass away. Please see my 1st "sub-post" for additional information on this issue. 1941 saw the introduction of a Seiko (with an 11 ligne movement) using Japanese characters on the dial, though the "SEIKO" name remained in English. Later during the war, "SEIKO" text was replaced by Japanese characters. In addition, 24 hour dials were mandated by the military." this information is super valuable for Seikoholics

Here you go, this watch listed in early model and military watches section of Museum of Japanese made watches book. I really want to get that book in a reasonable price. About this model, this one looks like Longines Tre Tacche, it purposely made for military officer back in the 1940. Some says that this model is a post-war model, but as we know information about this watch is minimal. Have dug through old archive of old SCWF, it said: "1939 - 1945: WWII era, MILITARY models: SEIKOSHA Precision 1939 - salient features: double case, bold numerals on the dial, thick hands. In 1940, a center second model (reputed as the 1st of it's type for a Japanese watch - but maybe NOT a native Japanese design, see the Super ca. 1950), based on a Morris 10 Type (?) 15-jeweled movement, was introduced. I believe this is the same watch that other sources have called "Japan's first 3-hand watch". Versions were made for each branch of the service (different dial logos such as anchor, star, and cherry blossom). The cherry blossom model is speculated by some to have been for the "air force". However, those who know something of Japanese WWII military history know that there was an Army air "arm" and a Naval air "arm" (some carrier based, but others land based), but no unified "air force" - similar to the US in those days. The "Shimpu squadrons" [which many of us know as the "Kamikazes" - suicide mission craft] of the Naval air arm are the logical choice IF this assertion is correct. The suicide pilots often were compared to "cherry blossoms" due to their ephemeral nature, beautiful creations which soon pass away. Please see my 1st "sub-post" for additional information on this issue. 1941 saw the introduction of a Seiko (with an 11 ligne movement) using Japanese characters on the dial, though the "SEIKO" name remained in English. Later during the war, "SEIKO" text was replaced by Japanese characters. In addition, 24 hour dials were mandated by the military." this information is super valuable for Seikoholics via Instagram