My '73 Varsity has serial number CJ526842. Yours has K803410. It's the J that makes mine a '73; my guess is that yours is a '74 by virtue of the K, and for whatever reason the month letter that should appear before the K didn't stamp properly. I would call it a '74 until you get some better information.
I'll look around on mine and see if there are any other date codes on components, etc., and let you know where to look.
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I stop for people / whose right of way I honor / but not for no one.

Originally Posted by
bragi
"However, it's never a good idea to overgeneralize."