Inscription: A capital M within a circle (incised on the front of the bowl near the stem): probably owner's initial
Marking:  The monogram M within a shaped shield (cameo) (maker's mark of Hans or Johannes, Möller, or Müller, II, b. 1612 in Stettin, working in Königsberg, Prussia, as a goldsmith about 1650, d. 1663). See Wolfgang Scheffler, Goldscmiede Ostpreussens, Berlin, 1983, p. 92, mark no. 227, and pp. 91-92, no. 122.
Location of mark: On the back of the stem near the bowl.