Wildervankster Rijwielen Fabriek, Wildervank, near Groningen
A bicycle manufacturer, they were one of the first Dutch companies to build a motorcycle, in 1903. It was single-speed belt-drive, with bicycle pedals and chain. The engine was embossed with the company name.
The founder died in 1912 and the widow Baas continued to run the company for some years.
Source: mlagerwerf.wordpress.com
