1968-1969 were the Drover decaled bikes that used that guard. The ones with a squared topped kick up seat were the earlier, with the standard look kick up were later. Those bikes were the smaller 7/8" tubing frames. when they went to the
Sears exclusively sold 1" tubing and different chain guards I believe that they dropped the Drover name all together.....at least in any literature that has ever shown up.
I have the 4 page
bike instructions and parts list as well as the 12 page engine parts list and manual with a date of 1968 for the Drover available if you need them, they are scanned from OG manuals on heavy grade paper. The ones on
ebay for sale currently are copies of my copies and double the price