How do I get the display id of a view in Drupal 6?
Edit the view, then hover over the tab link for your display.  Look at the URL.  It will look something like:

http://thesite.com/admin/build/views/edit/the_view_name#views-tab-the_display_id

You should be able to use "the_view_name" and "the_display_id" in the drush command.