Hi Norma,

You might want to check out some of our partner sites. "Whats It Worth 2 You" is a site that gives professional valuations starting at under $10. By creating an account and sending them a photo, your item can be appraised.

http://www.wiw2u.com/index.cfm?fuseaction=users.Registration&act=form&eval_code=976338

Priceminer.com is another site to check to out. Priceminer looks at sites like eBay, and finds what past items have sold for. Although this might not be an exact value for your item, it allows you to see what kind of market is available for it.

http://www.priceminer.com/affiliate/affiliate.jsp?affiliateId=8749&bannerId=6

I hope this gives you a good start,

Eric

There are also a number of these listed on eBay.  Without more information it's hard to pin down a price, but you can use this link to see similar Hamilton Uprights currently listed on eBay.  It may help you get an informal estimate:

http://instruments.search.ebay.com/hamilton_Keyboard-Piano_W0QQsacatZ16217