I can vouch for the engine number as I have pics. No pic of frame number yet. I thought the engine number seemed high as well for such an early bike, the earliest in our directory. We have 10/E5, 12/E10 and up from there. I guess anything is possible with these machines.
A couple of things noted. Later speedo/tach, K1? Red kill sw knob. It does appear to have early smooth no crimp oil lines. Hopefully we'll see some more pics of this bike as its brought back to life.