...I've only ever seen painted metal, double-sided signs
similar to this design...the colors look off, and the fonts are all wrong...the outline around the perimeter of the sign in inset, unlike the painted version - - - AND the 'V' doesn't have the color transition where the blue overlaps the red!
...here's a link to an original painted metal sign as I described:
https://www.ebay.com/itm/1960-30-Or...ble-Sided-Metal-Hanger-Sign/273760061104...compare the fonts used for 'MOTOR OIL', and 'Ask For' on both signs...I wouldn't pay anymore for the sign you posted, than I would for a purely decorative novelty piece...