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Stainless steel buckle manufacturing.
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Previously:
Bubble wrap popping belt buckle - GIF
Seatbelt buckle gate lock - GIF
Sutton Hoo gold belt buckle - photo
I don't think that is stainless steel. An open crucible with slag on top skimmed and then laddled into the form... More likely an aluminum alloy. Also, the gray deposits on the guy's fingers point to aluminum/tin...
I agree it does appear to be aluminum or an alloy of same.
I'd guess zinc. A lot nonferrous die castings are Zinc alloys like Zamak.