IIRC, the first US military orders for CISO/SOG knives were from Japan Sword. Later orders had different manufacturers, thus the differences in configuration.
SOG Specialties had their reproductions made by Hattori, in Seki City, Japan. They claimed, in the early days of the company, that their repros were made in the same factory that made the originals. I don't know if this means that Hattori got one of the original contracts, or if they purchased a property where a previous owner had made the knives for the US.
The two contractors with CISCO were Japan Sword, owned by the Inami family (see Inami Hakusui - swordmaker), and Yogi Shoukai KK a trading firm believed to be a subsidiary of the large trading firm Nichimen. It is speculated that these two companies subcontracted to knife makers in Seki where the oem production of western knives had started in mid 1960s. If SOG Specialties' claim regarding their S1
is true the factory would be Masahiro, which is owned by the Hattori family. Ichiro Hattori was there until 1971 when he left to open his own factory, Hattori Hamono KK. Spencer Frazer contracted with Ichiro in 1986.
Photo: Japan Sword Co., Ltd, Tokyo 1960s.

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