Doing online ARMBRUST research I stumbled on a Matthias ARMBRUST - Blankenese, listed as a Seelotse (Sea pilot ?) 1903 with an address of Westerweg 10 given. That appears to be across the river (south) from Blankenese. This Matthias may be my g'grandfather Peter Hinrich A's brother.
Would anyone have any information on this Matthias ARMBRUST or know of a way for me to track him down online ?