Linn CD12 MK3

A friend of mine who is a long time Linn's user told me about Linn CD12 mkIII. He previously used Linn CD12 mk1, mk2. Also,he has Linn LP12SE full stack and Klimax DSM in his system. He had purchased this USED Linn CD12 MK3 for $18000. To my knowledge, Linn CD12 CDP mk1(20bit) and mk2(24bit) serial number are of 3digits. But this so called Linn CD12 MK3 had 6 digits serial number. He said this CD12 MK3 is very rare and Limited. My friend has A/B comparison many Linn sources in his own system. And what he said is CD12 mk2 better than mk1. But the 6digits serial number CD12 MK3 is a true Linn masterpiece. It easily beat mk2 in every aspect. He had compared to Linn LP12SE full stack, and the new Klimax DSM and he even prefered Linn CD12 MK3. He told it preserved the Linn's maximum musical magic of LP12SE full stack plus more dynamic extreme, more details yet very musical.
My question is who ever had experience in Linn CD12 6digits serial number MK3? I have never seen this version before. Where can I get one?