Most have minimal value, but pre 1900 whiskey bottles, especially Western embossed whiskeys may be valued from several hundred to several thousand buck or more......
Here are a few links to give you a little background....Reg
One of the premier bottle auction sites: http://www.americanbottle.com/past-auctions.php
FEDERATION OF HISTORICAL BOTTLE COLLECTORS: http://fohbc.com/
OLD WESTERN WHISKIES: http://www.globtopwhiskies.com/
Thanks.
I have one plainly marked Dr. Miles Laboratories that cleaned up nice.
Another that is almost more of a glass than a bottle, in pale green glass with alot of bubbles - but interestingly, Chinese characters on the bottom.
And one that looks like an old Milk of Magnesia bottle or something. The classic blue glass. I hear some of that is rare, but not sure what.