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SA Type 2 with no drawing #?

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    SA Type 2 with no drawing #?

    It is trackless. https://imgur.com/a/gFfYZBN

    #2
    I don't know what SA Type 2 means, but my opinion is that the first three apertures are aftermarket

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      #3
      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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        #4
        middle two are aftermarket for sure

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          #5
          Got this aperture from Mac years ago, short life period in service. Click image for larger version

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          • RCS
            RCS commented
            Editing a comment
            without drawing number too

          #6
          Originally posted by Orlando View Post
          middle two are aftermarket for sure
          Agree middle 2. casting marks.

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            #7
            So the first one is correct?

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              #8
              mine is original and has 17 teeth yours has 16 teeth. Need to compare the first aperture with another with the drawing to be certain.

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