I found a bottle of whiskey-Bourbon in my basement, does anyone know about appraising antique bottles?!

I found a bottle of whiskey-Bourbon in my basement, does anyone know about appraising antique bottles?

it is a glass decaunter and it has decorative stars cut into the glass
it has a glass cork and the original label that says harim walker & sons i don't know how old it is or how much its worth
any info would be helpful

I don't know a lot about appraising bottles, but Harim Walker and Sons has been discontinued for some time. I recommend looking into either of the two websites. The whiskey auction will pull more money than ebay ever could.
If it is sealed (with possibly its original container) and still in decent condition, i'd say it would fetch a minimum $100. Old decanter's alone in decent condition can go for ~$10-25 (flea market prices) for the more common ones. Hope this helped.

Also, once it has been removed from the barrel, distilled spirits (unlike wine) do not continue to age.