...the sign sure looks right to me...I think the lack of detail has to do with the small size of the hourglass...the 'coupons accepted' lettering is hand-generated, and the sign has typical shelving and gloss of an old sign...and the maker's mark looks right...I think it's right...
...'true value'?...should be a LOT...
...I copied the attached photo from somewhere online, might have been Oldgas or eBay, about 3 years ago...looks like the same sign...