Yes, I note that this model ran over two seasons:
that is, 1969-70; 1970-71.

The distinguishing feature here is the 'boxy' muffler.
This 'Thru-Baseplate' muffler was introduced late in the 1970-71 season (on this model);
meaning that this machine would date from sometime before September, 1971.

Hope this helps.
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JACK.