German, Aschersleben Potash Works Seal

German, Aschersleben Potash Works Seal, Image & Found by Frederick Scott Ohnemuller.
Found in Egg Harbor City, New Jersey, U.S.A, 24mm.

F., KALIWERKE curved down .ASCHERSLEBEN. curved up around // crossed hammer & pick, SALZBERGWERK.SCH...ALL. around

A seal from the Aschersleben Potash Works. Salzbergwerk means salt mine in German, the name that follows it may well be 'Schmidtmannshall' named after H. Schmidtmann who took over the mine in 1883 see Aktiengesellschaft Kaliwerke Aschersleben, Albert Gieseler, Mannheim, Germany 2009, "1876 Start of test drilling by the London "Continental-Demond-Bork-Baring-Compagnie", similar to the one in Stassfurt, around Aschersleben. The wells are successful.
1882 The first shaft is being built after four and a half years of construction.
01.1883 Start of potash mining; mainly carnallite is mined.
1883 The entrepreneur Schmidtmann, who took over the mine, founds the "Kaliwerke Aschersleben trade union".
1889 Conversion into a stock corporation. - The company is quickly developing into one of the largest German potash companies.
1922 Merger with "Consolidierte Alkaliwerke Westeregeln AG" and "Salzdetfurth AG".

More history and images of the plant can be found here - Die Kali- und Steinsalzschächte Deutschlands,
"Aschersleben potash works in Aschersleben
Founding:
1. As a drilling company in 1876,
2. as Grewerkschaft on May 3, 1883,
3. as a stock corporation on October 14, 1889,
Statute changed on March 3, 1899, May 13, 1912, June 28, 1919,
April 15, 1920, December 11, 1920 and June 9, 1921."

A postcard of the works can be seen here.

From Philippe Lanez, "the back side of BSG.BS.02028 reads 'Zalzbergwerk Schmidtmannshall'".