If the seams are up and down the bottle(hard to see) and if they reach all the way to the top of the bottle, that would mean a bottle around 1920 and up. If no seams or a seam that does not reach the top then that would mean 1920 to 1880's maybe 1870's. Hand blown stuff with no seams would be even earlier. That would be general information on most bottles but I am sure there are exceptions. Hope that helps a bit. jgas