It's an upright? Well you'd need to not only get it tuned, but at that age a full (tone and sound) balance and tune; it should cost anywhere from $50 to $200.
as for the value, i will try and get back to you on that. Im not to familiar in that area.
edit: a quick goole showed this:
http://www.concertpitchpiano.com/PianosForSaleTechnicians.html
Keep the piano. Not worth selling IMO if you are willing to learn how to play it.
update:
"Heintzman had moved from Toronto to Hanover, Ontario around 1961. I worked there in late '63 for a few months. I believe they owned a few shares in BPA (British Piano Action) in Wales. They had retail stores throughout Canada until 1979. They also built the small Nordheimer and Gerhard Heintzman pianos. Quality wasn't nearly as good after the move. Sklar-Peppler, a Hanover furniture maker, took over in the early '80's for about five years and built a real fine piano. The finest of all Heintzman pianos were built from about 1900 to 1925, not to be confused with the lesser rated Gerhard Heintzman piano, also of Toronto, a distant relative of Theodore Heintzman." -taken from:
http://www.ptg.org/pipermail/pianotech/2000-January/058001.html
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