One of the sheffield labs discs, Lincoln Mayorga and Distinguished Colleagues "Missing Linc" II . direct to disk..

apparently it was a disc that Marantz got from Sheffield to send to its distributors to use as demo discs for Marantz equipment.. there was even a blank order form inside, as well as instructions from a Marantz suit...on official Marantz letterhead.

anyway.. the disc is amazing, sound wise. Just jawdropping amazing..

if you can find it, please do.