The undercarriage is what's interesting. Who makes that?
Good catch. I missed that. Look at the loader arms. That´s not even a production track loader. It looks like a high track D4 with an after market loader attachment (trima or similar maybe?)
Its a 939C , you can tell by the ROPS supports for the cab and also by the fuel and hyd. tank that it was never a D4 or a 5