I think the buckle and belt look ok as for originality, the buckle has the double circle around the RZM. But for sure, best wait for Ben to have a look.
they would seem to go together.
The buckle is an original injection molded HJ, the belt is a M36 combat belt, the set would not have been issued together but could have been worn together at some point, towards the end of the war they would have worn what was available
Buckle again is original, makers mark looks like Schmole & Comp but the buckle is not a typical Schmole & Comp buckle, also the tab has been taken off at some point and put on the wrong way round, but both are original
The other strap to me could be post war and welcome to the forum BTW
I thank you for the welcome.Everyone has been so nice and helpful,the amount of knowledge that is being shared is staggering...
Have a read of this thread, it may give you a better understanding