This can't be that hard to solve. Richard Biddulph found this pre 1914 Panhard & Levassor and freed it from a long time museum rest. There is this one little issue. The car has no identity, we just don't know what type and year is connected to the pleasant looking motorcar. The good news is that we do know a few numbers. Chassis identification is 8F-16859 and SU4D2, plus embossed Y. Engine number is #2153. Based on the information of Les Doyennes Panhard the monobloc sleeve valve engines came in 1914 and this engine looks like a sleeve valve, or ? So if we are right this could be the mentioned X26 16HP. When not a sleeve valve it probably one of the 1909-14 monoblocs. Tell us where we go wrong, or not. A friendly car like this deserves a proper name on its 'passport'.