Sorry for the delay in getting this sorted

I now have the little list... I am not guaranteeing that these are 'half speed masters' but I do know they are Japanese Imports, where quoted

I will tell you what I know:

1. Marvin Gaye - 'What's Going On'... with original sleeve band etc. Number: VIP 6011 Y2500. Motown... Makoto Yagi... Made in Japan by Victor Musical Industries
2. Michael Jackson - 'Thriller'... almost certainly a half speed master... Mastersound.... CBS/Sony... Number: 30-3P-431.. Japanese
3. Toto - 'IV'.. with original sleeve band etc.... Mastersound....Japanese
4. David Bowie - 'Lets Dance'.... with original sleeve band etc...Japanese but probably not a half speed master
5. Bob Seger - 'Night Moves'...almost certainly a half speed master but NOT a Japanese Import

I hope this is of some help...