Here's one of the earliest and most unusual pre-recorded reel to reel tapes I've seen turn up on ebay.
This is the soundtrack album for "The Living Desert", Disney's first "True Life Adventure" film. The tape is basically made on a stock Scotch blank tape with a label pasted over the box; it has an unusual large flange reel with the title and speed directly printed on the reel itself. It probably dates from 1954 or '55. (It reminds me of some of the early Columbia reel to reel tapes that turn up once in a while that have a generic Columbia box with small labels printed on them for the particular tape inside.)
I'd be curious how many of these were produced and if Disney put out other reel tapes in the mid-fifties.
auction at ebay