Geo S. Parker Vacumatic Fountain Pen, Need help identifying what year, and model type

Trying to find some information about this Geo S. Parker Vacumatic Fountain Pen. The barrel of the pen says it was Made in America, and has the number 6 surrounded by 3 lines, one line on the left, and right of the 6, and one line underneath the 6. The nib, or point is gold, and says Parker USA with the number 6 underneath USA. The cap has a silver ball with gold trim on tip.

If there is anyone out there with any information on this pen, your help would be greatly appreciated. Thank you very much.