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Hello! Can anyone help identify the master? I think it is Denmark.

Hi Nata37,

it is Denmark!
Take a look:

townmark: Copenhagen 17??


assay master: Christopher Fabritius II, court juweler (1749-1787) - no 1755


master: Brandt Jonsen - no. B4-778
Brandt Jonsen was born in Island ca. 1719, buried 26.03.1777 – his widow Catherine Tronerup married Christian Werum, who took over the workshop.



Source:
Danske guld- og sølvsmedemærker før 1870, 4. udgave, revideret og udvidet af Henrik Jakobsen, Odense 2022, p. 25, 27, 108, 109

Regards
Silverstone

Thank you very much for your help!