I recently bought a 14B and a 32B, both from 1988. Surprisingly (to me), they both have very cheap plastic slip cases, heat welded along the periphery with a fake stitched seam.
My question is: for how long were these cases used before being replaced with the much nicer padded and stitched type used until today. I don't think it was for very long as my 14B Anniversary from 1989 has the second-version case.