Vidrierias del Guadalete
Vidrierias del Guadalete SA was founded in the port of Santa Maria, Spain on October 29th 1943. The glass fishing floats manufactured at the glassworks are two-piece molded. The marking is 'VG' on the sealing button, the straight 'Vidrierias del Guadalete SA' on one side of the glass (written in four lines) and 'Puerto de Santa Maria, España 1945 (or could be another year)' that is written in three lines.
Huge thanks to Todd for providing photos and helping us to figure out the marking!

An old advertisment for the company's bottle products.

'VG' with the cross over. With the 'PO' letters above and 'St. Maria' on the bottom. 5" in diameter. The color is teal. From Todd Marvik's collection.