Whiskeyman, thanks for the welcome and for the info. I contacted Tom and he was extremely helpful. He told me he thinks my bottle is Italian, and not Clevenger. He added the mold resembles one used by Clayton Glassworks (Jersey glassmakers down the street from Clevengers) and also Downer Glass Works, but doesn't have the same base. He even included photos for comparison. The photo of the Downer crown bottle also had a crimped mouth. Interesting stuff. Thanks again for your help!