Johann was born in 1831. He passed away in 1918.
Death Certificate: https://www.ancestry.com/mediaui-viewer/collection/1030/tree/4871533/person/-1531648066/media/a912ca2e-b352-4b7f-9874-dce9a46a3209?_phsrc=DSt4635&usePUBJs=true
D > Dahm > Johann Jochim Heinrich Dahm