Check these threads for more info
http://originaltrilogy.com/topic/Print-variations-in-77-Star-Wars/id/14705
http://originaltrilogy.com/topic/Credits-and-Leaders-Thread/id/12960
Yotsuya has relatively recently re-created the early version
http://originaltrilogy.com/topic/Yotsuyas-Saga-Preservation-and-Restoration/id/55257/page/1