I Googled this:

http://atlantaantiquegallery.com/i-4966306-victorian-crackle-glass-9-1-2-flask.html

It is a safe site that goes to the Atlanta Antique Gallery. Shows your bottle in blue. That's a retail price, but none the less........Thank you grandpa.

“What we have done for ourselves alone dies with us; what we have done for others and the world remains and is immortal.” ~~Albert Pike, Freemason