Check for a date code on the data label under the unit ... Miele's are fairly intuitive.
This is from the dealer site:
WHITE PEARL perlmuttmetallic S434I 07/1995 03/1998 Vacuum cleaners Miele US
WHITE PEARL perlmuttmetallic S444I 12/1997 10/2000 Vacuum cleaners Miele US
So it could be from 1995 - 2000 assuming it is an S434 or S444
Thanks for that, I still have not heard back, it was listed 15 days ago, updated 5 days ago as of yesterday she said not sold, but won't reply with detailed info, or agree to me making a 15 mile drive, so not a clue