Well if I understand where this puzzle is going, it appears that we are looking for a French 6 cyl. engine, and possibly a French marque, but with some sort of Italian connection. Therefore, let's try this scenario: In 1907 De Dietrich purchased Isotta-Fraschini, who produced chassis into which De Dietrich installed their engines, for sale as De Dietrichs. In 1908 De Dietrich produced a six cylinder 70/80 HP engine. I don't know if this engine was ever placed in a Isotta-Fraschini chassis, nor can I find a picture if the De Dietrich 6 cylinder, but on the chance that this might be the correct answer, I'll guess that the puzzle engine is a 1908 De Dietrich 6 cylinder 70/80 HP.