The very first thing I look for on anything is the wear. Is there any wear on the bas of this vase. You can usually tell if you hold it to the light on an angle and look for a fuzzy ring around the base. the more scratches and frosty it looks the older it is usually. As far as I know anyhow.
what a site! Very impressive to see all these bottle collectors. I'm so glad to have found it. I have just started collecting so, I'm learning something new every hour. Looks like I'll be spending a lot of time here.