These are license buikt MF from former yugoslavia. (i think IMT quit during the civil war there, 20 years ago)
Isnt the engine a genuine Perkins ? then with the engine model number it should be easy to get the information at the MF dealer.
They started putting the genuine Perkins in them 1967 1966 and older wasn't genuine Perkins. Our MF dealer has no idea. Thats why I thought I would try You'll Thanks. Any more suggestions ?