TC - an independent answer for you on MD600s.....
- highest MSN registered by MD = #67
- highest MSN verified delivery by MD = #58 in May 2001
Of these, 11 are in the UK (including one no longer active ie written off). And of these 11, at least two are for sale, one due to death of owner, one due to high increases in charges and hassle at a certain London heliport, previously a frequent destination for the owner.
So this suggests #59 to #67 are "white tails" at the factory - I have just checked and confirm all are registered in MD's name. I note that #59 is on the FAA register as a 2000 build.