Two Buckles, Good or Bad?

[Nan Su]

My friend's new collection,
Can you send your opinion about it (fake or original?)
Thank you
Su

[Ben Evans]

Hi Su and welcome, the Luftwaffe looks like a cast fake to be honest, as regards to the SS do have a better picture of the makers mark and prongs? Also can you get him to measure the buckle?

[Mess Truck]

Looks like they were made by the same manufacturing process. Are they zinc or aluminum?
Glenn