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Master I. A. M. of Zwolle -LRB- known works 1470 -- 1490 , lifetime estimated as ca. 1440 -- 1504 -RRB- was an anonymous Dutch goldsmith and engraver who signed many of his works with his initials I. A. M. or I. A. , and added `` Zwolle '' to some .. Dutch. Netherlands. goldsmith. goldsmith. engraver. engraver. Zwolle. Zwolle. His work is characterized by crowded and active scenes of people , graded tones and crisp strokes .. Only 26 works by his hand are extant .