Special Forces Project Sigma engraved knives - serial 's to - in These are not counted in the qty made for The blades are 2 line marked on the logo side Sheath strap went from right side to left side near the beginning of production. Fine serrations, which became an option from to , were 14 teeth per inch. Serrations of 12 teeth per inch were observed in to period of production. Coarse serration introduced in were 8 teeth per inch Yellow dive knife introduced in - there were no records kept of how many were made but some indications of approx ?
No serial 's Orange handles made in and last one in ? Yellow dive knife discontinued in Presentation models introduced in The green sheath was introduced in and could be found into early However knives can be found that have no serial number and some are totally unmarked, missing both a serial number and the Gerber logo.
The number of these knives is unknown. Serial numbering of production knives started with a six digit serial number, in early and continued to serial at the end of Most of these knives have blades which are made of L6 tool steel.
This is a roughly Aug. The very early serial numbers were inverted, i. I have records of three blades , and stamped in this manner. There is speculation that the early inverted serial numbers appear only on the first day of the Mark II's production. I have no idea why the change was made. In an alphanumeric numbering system was used. The new serial numbering system started with serial AS and continued to at least NS, the highest serial number that I have encountered.
Special order requests for knives with L6 tool steel blades were honored for a short period after the start of the new serial numbering scheme. These knives were denoted by stamping with a trailing "T" for tool steel rather than the "S" for stainless.
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