He advised his followers to use the rosary as an aid to meditation.
Not surprising since he was catholic, old habits die hard no pun intended. Never heard of its use since in Lutheran circles. While the Magnificat and Gabriel's greeting to the Virgin are read and the Magnificat sung during the season, the emphasis is on Christ as her Savior as Mary intended in response to her cousin's greeting.
Have you ever or do you now pray Luther's "rosary"?