SONABEL Type BOF Horn Compressor, 6V I guess for a complete horn you also need the pneumatic horns, that would be connected using a firm hose to the outlet of the compressor.
WANTED Fabrique Nationale (FN) car & motorcycle parts 1907 - 14
Interested in parts or info for 1907 - 1914 FN cars. Shown in the second photo are the brass steering column flange, aluminium 5 spoke steering wheel ..