According to this webpage, there was a German textile factory established in 1876 in La Constancia, in the municipality of Nombre de Dios, Durango:
http://www.e-local.gob.mx/work/templates/enciclo/durango/mpios/10016a.h…

http://www.nuestro-mexico.com/Durango/Nombre-de-Dios/La-Constancia/

Nombre de Dios is a town between Sombrerete, Zacatecas and Durango, Durango. It is the head of the municipality where La Constancia is located. Chances are the name of the factory was "La Constancia" and the settlement around it took its name.

Later the factory took the name of "Londy" or "Lundy" and produced rugs but it closed in 1981:
http://www.elsiglodetorreon.com.mx/noticia/306271.se-repartiran-londy-e…
http://s4.elsiglodetorreon.com.mx/noticia/303413.disputan-terrenos-de-e…

Victoriano Navarro