Looks Prussian. 1/90th of a thaler was 4 pre-decimal pfennigs. The other side should say, "scheide munze" around the top, "4 pfennige" and the date across the middle, and the mintmark (which is normally "A" for Berlin) at the bottom. Krause references are: KM# 408 (1821-1840), KM# 412 (1823-39, D mintmark only), KM# 433 (1841-2). It can't be later than that, because the crown shape above the shield changed then to something more dome-shaped.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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