The Making of Star Wars, VHS, Twentieth Century-FOX Video, UK 1982
Twentieth Century-Fox video released this the same year as the first Star Wars was released to home video for the first time. I assume there's a Betamax equivalent, but I have yet to find it.
I never knew this tape existed until a surprise find on eBay UK. I had to go through some hoops to get it, but luckily I have a mate in the UK. (Thanks Ryan).