Thank you to Jon Proctor for sending me this image that he scanned. It is an Eastern Airlines company photo and I cropped the photo and removed a ton of spots to make it more presentable. The Eastern Airlines caption on the back of the photo says:

"Eastern's 352-seat Boeing 747s went into service December 21, 1970, between New York and Miami and New York and San Juan. On January 21, 1971, the aircraft was placed into regularly scheduled service between Chicago and Miami. Features of Eastern's 747s are an eight-seat lounge at the aft end of the main cabin for coach passengers, as well as an upper deck lounge for first-class passengers. A chief purser is assigned each 747 flight to supervise all aspects of cabin service. Eastern varies its cabin staff of 11 to 15 flight attendants based on the number of passengers holding reservations for a given flight."