Everything you have as probably some sort of value attached to it. Sometimes this value is founded on how you feel about a certain item, while other items are given values assigned by others. The same applies to old coins and other coins in you collection. While professional coin dealers or expert coin collectors will know the old coin value for various coins, we may have no idea about this.
Once you are confident in your guesswork you will need to see what the actual experts say have to say about the old coin value. The best thing that you can do is to visit your local