Okay
, forgive me if this doesn't make it past the third round. According to the search tool however, I didn't use it already nor did anyone else.,
1. First flew prior to 1920
2. Twin V-12 power
3. It had predecessors; a small number of experimental prototypes and the first production version (>100 made) used up the first two model numbers
Let's see.... V-12 engines, two of them, prior to 1920, that should narrow the field. Thanks; Ernie P.