This morning in further searching I found the first birth of the couple I am especially tracking, Nicolas BACH, b 1820 (at Langenfeld bei Malmedy, BE, and Elisabeth LOUIS / LOUEN / LOEWEN b 1831. Michael was born 20 Feb 1855 at Luetzkampen, PRU, just one mile from the current Belgian border, but according to Thomas Pick's website he was baptized at Welchenhausen, a couple miles to the north. Probably Elisabeth is from that parish-- several LOEWEN are found, including Elisabeth, b 11-10-1831 to Michael LOEWEN and Margaret BELGE.