Thirty years or more ago, a buddy and I went to an "estate sale" and I bought several old (full) bottles of liquor. The one I'm looking at right now is one of two unopened bottles of G. H. Mumm extra dry champagne, lot #5014...I'd love to know how to research this stuff. I'd have to just guess that these were bottled in the 1930's or 40's.
Another is an empty Clicquot Club ginger ale bottle...I know it can't be, but it looks handblown due to imperfections in the bottle; there's a nice mark on the bottom, but only about a quarter of the label still exists.
Fun stuff...
You can look on EBay and Amazon under collectibles as well. The book will allow you to understand the history and identify what you have. For example before 1902 the formula of glass was such that when exposed to sunlight the glass would change to a light purple or rose color. This is one way of dating the glass. I was a a farm auction in North Dakota where the item of interest was a Model T. It's headlights glass had been exposed and they were a truly stunning pink!
I have a whittle model bottle with an applied top. You need to learn these terms and you collecting will become more fun!
Try www.kovels.com. They have volumes on collectibles and antiques with their auction appraisals and values.
I also have a few Avon collectible (argueable) liqueur
bottles from the 70's, but someone (my Dad) broke the
seals. They are very attractive artistically, but I
don't know how glutted the market is.
Now to put a back story to your bottles. Why would
they not have been consumed and for what occasion were
they intended?