Here is a picture of the Kirby Classic III cloth bag stitching designs throughout its run.
Picture at left is of the plaid stitching used between June 1976 and November 1977. Original bag part # is 190076 for bag itself, or #190076S for complete bag with cap and guard.
Middle picture is the plaid stitching used between December 1977 and November 1978. Original bag part # is 190077 for bag itself, or #190077S for complete bag with cap and guard.
Picture at right is the plaid stitching used between December 1978 and May 1979. Again, the part is #190077 for bag alone, or #190077S for complete bag with cap and guard.
~Ben

Picture at left is of the plaid stitching used between June 1976 and November 1977. Original bag part # is 190076 for bag itself, or #190076S for complete bag with cap and guard.
Middle picture is the plaid stitching used between December 1977 and November 1978. Original bag part # is 190077 for bag itself, or #190077S for complete bag with cap and guard.
Picture at right is the plaid stitching used between December 1978 and May 1979. Again, the part is #190077 for bag alone, or #190077S for complete bag with cap and guard.
~Ben
