Tübingen am Neckar. Württemberg, (now Baden-Württemberg)
Zinngießerei. / Pewterer.
Assumed to be a decendant of Zinngiessermeister Peter Dietrich Boeckmann (b.1775 - d. 1838) Peter Dietrich achieved his master's status in 1802.
Reference:
Thought to be "P" Boeckmann on the underside of a stein lid, which shows the student dedication date of 26th July 1898. 