While going through my deceased father-in-law's tools i found an old standard oil 5 gallon can, i think its for gas as it has the pour spout and a large "vent" opening screw on cap. its blue with white "standard oil" lettering, has no logo or any other marking other than the 5 us gal. label. its all original with little external rust. (sorry can't get pics up here) still holds fluid he used it to hold 50:1 mixed gas/oil i had to clean out of it. i can't find one similar to it online to compare value and want to know a reasonable price range to ask for it since we aren't collectors. any guidance would be appreciated. thank you.