If this is the wrong forum, please let me know. I didn't see one devoted to antiques or collectibles. I was down at the family business (a newspaper/print shop) and happened to see these quarts of oil underneath an old press that hasn't been used in at least a couple of decades. Is the number in the 3rd pic saying it was made in July 1981? I sort of figured they'd be older. What do you think? My apologies if they are flipped horizontally. They are vertical on my computer, but for some reason they look like they are going to upload horizontal. :-(