Many, many thanks for the help, I believe too it's a "one of a kind" motor maybe somebody will name the designer someday. I had even not noticed that it was a Taplin carb on it !

Thanks also to everybody for the great appreciations you left about the web page, I just improve the translation system and add a new page about austrian HP engines, you can try it : http://e.a.t.chez-alice.fr/AAmoteursminiatures.html .

A few weeks ago this superbmonosoupape has been sold on e--y France with a direct offer at 1500 Euros ($1800) my modest 300 euros offer was not very serious , this "beautée" was probably a prewar I (circa 1910) Letang engine made by a Mr Letang in Paris to power a mahogany speedboat on the Bois de Boulogne Lake (see the old postcard) ....We are far from from the diesel topic but it worth it !