1936 Sinclair Gas Premium Book

Dated 1936 on the cover. 5" tall. Has a gilded seal attached with brass grommets to the front. Says you were supposed to get a receipt for every 10� you spent at a Sinclair station which you would put in the book until it was full. Then you took the book to a station manager and he would break the gilded seal to reveal what you had won which was anything from an automatic shotgun (can you imagine that!) to a Hammond Modern Electric Clock. Slight aging.