I would value your signs in the range $500-800 each.The motor oil version appears to be in somewhat better condition, however, there do appear to be some pinholes or extra drill-holes (better pics would help). I've seen really nice examples of these go for over $1500 at auction recently.

IMO the ebay example you mentioned for $800 is priced way too high due to its poor condition. And of course the asking price doesn't mean much on ebay.

https://www.ebay.com/itm/Vintage-1930s-ATLANTIC-GASOLINE-Refining-Company-Porcelain-Sign-Gas-Oil-52-x35-5/174008745147?hash=item2883babcbb:g:7uUAAOSwCdxdYr2m

Last edited by jecos; Thu Oct 24 2019 11:10 AM.