Hi Rich,
The one beside the Accountability number on the blade is also Tokyo's Koishikawa
Fuchi has three Arsenal seals: 1. Cannon-balls (Kokura and Koishikawa), 2. pre-1936 Koishikawa, and 3. Unknown . This makes it probably of 1934 or 35' vintage.
The clincher is the third one. If you find anything, kindly let me know.
Best regards, and Merry Xmas to you and yours.
Manuel
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