Weird thing about the M-12 was we were looking for an other crashed aircraft! We only found a very large piece of aircraft skin with rivets and more, and a lot of very small single rivets on other places. The crash site was thoroughly cleaned after the crash long ago.

It turned out to be te Dutch KLu T-33 M-12, which made a failed touch&go on a training sortie. The 'go' did'nt quite turn out well and it crashed in a wooded area. 

Particularly astonishing fact was that the large piece also held a Parts Type Identification Plate deep inside it! It identifies the aircraft type and serial number (construction number).

The type is T33A-1-LO and the construction number 725_; which can only be for this crash location  the 7250, which is the M-12 (324sq) - crashed 9-7-1963 at the exact place where we found the part(s).