I don't know how rare early Sound blaster clone cards are, but here she is:

It's an Anchor Electronics Media Concept 2.0 (SB clone). As far as I can tell it uses a few parts found on the creative SB 1.0, some off the 2.0 and some custom parts. I tested it with the creative sb driver and it works, but doesn't sound quite right in some games. After tracking down and installing the correct driver for this card, all issues went away - and it sounds lovely. Then again the original driver only adds the SET BLASTER and SET MC arguments to autoexec. The big 74xxxx chip seems to be a regular OPL that has been re-etched, same for some of the other chips. The 3 empty sockets will take CMS chips off a genuine sound blaster. The only custom chip as far as I can tell is the MS1006.
With it's own drivers installed it has great output - no noise, no distortion and the OPL sounds genuine (at least to me). The card is made in 1992.
Games tested: Monkey island, Lemmings, Prince of Persia, Keen 2, Keen 4 and Supaplex.
P.S. - got it from a fellow vogons member.