Thanks everyone. Semi 60, yes I did find and DL the Muir chart but did not see a 133 coded gypsy. But, you have prompted this idea, I see the 5/16 wheel is coded MPH1200133. Could it be possible that the stamped 133 referers to this gypsy? That would sure explain a lot - 3/8 chain in a 5/16" gypsy???
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