Help identify aircraft motor

Was wondering if anyone could help me identify this aircraft motor I came across and tell me more about it. Much appreciated.
It’s a flat 4, two-cycle engine.
Type: M2791
Serial no.: 267
Rating: 70hp- 4100rpm
Meteor – Trieste
Aircraft and electronics industry.
And has a stamp: M3

Drone engine, built by Meteor s.P.A. of Triest (Italy). Probably used for the earlier generation drones like the P.70 (may be a license-built McCullough flat four engine?).

From the rating it could have been used on a drone or target aircraft used for target practice. Be better if you could post a photo.