There are several price guides on gas/oil memoribilia and you can check some of this at your library. Research will show that some signs are more valuable than others because of the name/graphics/condition. Porcelain (which yours appears to be) command higher prices than those painted. Gas glass globes command even higher prices for obvious reasons. Yours appears original and good condition. The last one I sold was a porcelain triangle Quaker State in cast iron stand for $400 and that was a few years ago. I would do my homework (priceguides/Library) and have no problem starting it at $600. You can always negotiate. Yours is in very good condition, very little damage/rust/etc.