B&W Bowers Wilkins Speaker Tweeter HF Unit - Lot1
Model ZZ5460
This was from a DM-610 speaker, but I think it will also fit DM600, DM620, DM630, and DM640, best to check first.
Tested and working. The dome is a little bit dirty, but I think it will clean off. It comes with the original rubber cover and original mounting screws.