I have a military record of Johann Gottfried Fischer from 1849 from the city of Mallnow, district of Fuerstenturn, county of Coerlin, Prussia. His son Friedrich Carl Johann Fischer born in 1860 was confirmed at the Evangilish Church in Coerlin in 1874.
They may have been married between 1850 and 1856 most likely in Coerlin.
Any info would be helpful, but who are their parents?