Never heard that rule... IT would really depend on the specific attachment used, not so much the dremel itself.
Note: They were Nickel Plated at this time, not chrome.
Those plated parts are not as bad as they look. With Brasso and 0000 Steel wool (or Aluminum foil and water) they will clean up to be bright and shiny. really really
EDIT: I'd buy that from you any time you get tired of it......