Of course, I got excited and I watched it, but then I questioned it's authenticity. We're in a world where now it's possible to replicate so many different things: money, jewelry, change appearances in photos, well - pretty much anything can be altered via computer programs. I almost felt bad for questioning its legitimacy being that it lacks a lot of complicated features that we have these days, but then again, I suppose that would make fabricating it that much more simple.
After reading the information to the right of it posted by the British Film Institute, I'm leaning more towards that it's indeed real. My, how fascinating!