The families Stiehr and Mockers were renowned organ builders in Alsace, France, with their workshop operating for over four generations from around 1780 to 1926 in Seltz. More than 250 new organs by the family are documented. The founder, Michael Stiehr (1750–1829), originated from Kürnach near Würzburg and established himself in Seltz in 1777. His son Joseph Stiehr (1792–1867) and Joseph's sons, Léon, Edouard, and Louis Joseph, continued the family tradition. Xavery Mockers (1780–1861), who joined Michael Stiehr's workshop in 1804 and married his eldest daughter, also contributed to the legacy, with his sons François Joseph and Felix Mockers further advancing the craft. The family business continued under Léon Stiehr and Louis Mockers until 1926, focusing mainly on the Lower Alsace region with a few instruments delivered to Upper Alsace and other areas.

The Stiehr and Mockers organs are characterized by a blend of traditional and innovative elements. Michael Stiehr adopted the Alsatian tradition from Johann Andreas Silbermann, utilizing dual-manual organs with main work, Rückpositiv, and pedal. His instruments often featured a principal chorus, mixtures, and traditional stops like Trompete and Voix humaine, alongside new stops like Gamba and Salicional. After 1830, the Rückpositiv saw the removal of Terzen and Mixtur, with additions like Basson-Hautbois. The 1840s introduced open wooden flutes and occasionally transformed the Rückpositiv into an Oberwerk. By 1860, the first pedal coupler appeared, although it was not widely adopted. Despite technological advancements, the Stiehr and Mockers family adhered to mechanical systems, avoiding pneumatics. Their last organ with a Rückpositiv was delivered in 1878, and the final organ was produced in 1897, after which Louis Mockers maintained the business through repairs and agriculture until 1926.

https://de.wikipedia.org/wiki/Stiehr_und_Mockers_(Orgelbauer)