I also own an Appleby 17C. I'm not the original owner so I don't know the exact year of its manufacture. Mid 1970s sounds about right. Mine was "rode hard" my the previous owner and has a few good scrapes and dings to show for it.
In the mid 1980s I had an Old Town sail kit fitted to it, but it sat for 20 years seldom used.
This summer I finally started paddling, sailing, and camping with it at every opportunity. It's a real joy and extremely versatile.
I know little about Appleby, but if you'll go here:
http://www.ruralmissouri.org/02pages/Mar02boats.html
you can get a feel for them. Sadly they're no longer in business.
Attached (hopefully) is the Appleby tied up at a state park campsite with the Old Town sail kit deployed.
