1852 AD., German States, Oldenburg, Paul Friedrich August, Hannover mint, 1 Schwaren, KM 185.

German States, Oldenburg, Paul Friedrich August (1829-1853), moneyer Theodor Wilhelm Bruel in Hannover (1844-68), 1852 AD.,
1 Schwaren (3 light Pfennig) (ø 16 mm / 1,33 g), copper, 1,50 g (?) theor. mint weight, mintage 144.000 , axis medal alignment ↑↑ (0°), plain edge,
Obv.: {PFA} , crowned PFA -monogram.
Rev.: 1 / SCHWAREN / 1852 / B , four-line inscription with value number above denomination, date and moneyer´s initial.
Jaeger 44 ; AKS 19 ; Weingärtner 1007 ; KM 185 .

Year / Mint Mark / Mintage
1852 / B / 144.000

The Grand Duchy of Oldenburg (German: Großherzogtum Oldenburg) (also known as Holstein-Oldenburg) was a grand duchy within the German Confederation, North German Confederation and German Empire which consisted of three widely separated territories: Oldenburg, Eutin and Birkenfeld. It ranked tenth among the German states and had one vote in the Bundesrat and three members in the Reichstag.
Its ruling family, the House of Oldenburg, also came to rule in Denmark, Norway, Sweden, Greece and Russia. The heirs of a junior line of the Greek branch are, through Prince Philip, Duke of Edinburgh, in the line of succession to the thrones of the United Kingdom and the other Commonwealth realms after Queen Elizabeth II.
Augustus (13 July 1783 – 27 February 1853) was the reigning Grand Duke of Oldenburg from 1829 to 1853.
Oldenburg did not entirely escape from the Revolutions of 1848 that swept across Europe, but no serious disturbances took place therein. In 1849 Augustus granted a constitution of a very liberal character to his subjects. Hitherto his country had been ruled in the spirit of enlightened despotism which had been strengthened by the absence of a privileged class of nobles, the comparative independence of the peasantry, and the importance of the towns; thus a certain amount of friction was inevitable. In 1852 some modifications were introduced into the constitution, yet it remained one of the most progressive in the German Confederation. Important alterations were made in the administrative system in 1855 and again in 1868, and government oversight on church affairs was ordered by a law of 1863. In 1863, Peter II, who had ruled since the death of his father Augustus in 1853, seemed inclined to press a claim to the vacant duchy of Schleswig and duchy of Holstein, but ultimately in 1867 he abandoned this in favor of the Kingdom of Prussia and received some slight compensation. In 1866 he had sided with this power against the Austrian Empire and had joined the North German Confederation, and in 1871 the grand duchy became a state of the German Empire.

More on https://en.wikipedia.org/wiki/Grand_Duchy_of_Oldenburg