It is trackless. https://imgur.com/a/gFfYZBN
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SA Type 2 with no drawing #?
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SA Aperature B8868-1 Type 2 November/1939 to February/1940 20000 - 28000 No tracks on the bottom of either side of the teeth and drawing number omitted. WRA Aperature B8868-1 Type 1 December/1940 to January/1945 100101 - 2540999 Parkerized stamped steel. May have punch mark on bottom surface. 60 degree crosshatch pattern on face. No tracks on either side of gear.
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