Old gas signs can be found for sale online through sites like eBay and through collector marketplaces like Primarily Petroliana. Resources like Collectors Weekly provide information to help determine authenticity and appropriate pricing for collectible vintage gas signs.
Oil signs came into use as early as the 1910s, with gas signs following in the 1920s as more service stations were built to fuel the growing number of automobiles on the road. Examples of vintage gas signs include tin store and post signs advertising standard services and porcelain pump plates with gas brand logos. The value of old gas signs is determined by the age, rarity, condition and uncommon features like being double-sided.