How can you find the value of a 1 troy pound silver 100.00 federal reserve note?

It's not made by the government, it's not a Federal Reserve Note, and you can't spend it in a store. However, it IS a privately-made bullion item containing a troy pound of silver so it's certainly worth a moderate amount for its metal content.

A troy pound is 373.24 grams or 12 troy ounces. Precious-metal prices change every day so any specific answer posted here would be out of date almost immediately. While it's not normal WikiAnswers policy to say "use the internet", that's the best approach in this case. You can check a site such as kitco.com, CNNMoney, etc. for the latest spot prices and multiply by 12.

The why (and what) of Troy Pounds:Troy pounds are considered to be an obsolete unit, something like a cubit or a guinea and are no longer used for precious metals. As a matter of tradition gold and silver weights are still expressed in troy ounces for market pricing, but grams are used in most other cases. It's possible that the company which sold this item used an obsolete unit to play on the confusion between troy pounds and US standard pounds, so buyers would think they were getting 16 ounces instead of 12.