#ZZCA015 - Group of two 1930 Gulf Refining Company invoices You get 2 for $1.00 (that's 50¢ each). Vintage invoices from the plant in Bethlehem, PA. They are all dated around 1930 or 1929. They list a lot of the products that Gulf sold at that time including various motor oils, lubricants, grease, etc. They show some aging and may have folds or very minor edge tears. About 8" wide. $1.00