If you are going to be able to find the value of your piano you will need to understand the terms that appraisers use to describe condition. If you are curious about what your antique piano might be worth you can consult the chart at Piano World.
However, if you are looking for a piano that can be used for a serious pianist you will probably want to put your money into a new piano. If you want an antique piano as a showpiece in your vintage home then it is fine to get one. Even when fully restored the piano won't play like a new piano, nor will it have the clear sound. Restoring and retuning a piano can easily cost $2,500 or more. That kind of work can cost the owner a lot of money. This means that each of these parts may need specialized restoration to bring them back to their usefulness. Each of the parts have been submitted to wear throughout the life of the piano. This is because a piano is actually a machine. Most antique, upright pianos are worth $500 or less in very good condition. In actuality these old instruments may be worth very little at all. Like antique books, antique pianos are not worth a lot of money just because they are old.
An antique piano is one which is at least 100 years old.