1 Friedrich d'Or - Friedrich Wilhelm III

The Friedrich d'Or was Prussia's primary gold trade coin through the late eighteenth and early nineteenth centuries, its name and form deliberately echoing the French Louis d'Or to facilitate acceptance in continental commerce. Friedrich Wilhelm III's long reign produced issues across multiple Berlin die phases, and the KM#415 series spans fifteen years of relatively stable Prussian monetary policy — a rarity given the upheavals of the preceding Napoleonic period, which had forced significant interruptions to gold coinage at Berlin.

The .903 fineness was fixed by the Prussian mint ordinance of 1750 and remained unchanged through this entire run.