What is the composition? That, rather than origin, would drive the cleaning method.
How to Clean Bronze Flatware » How To Clean Stuff.net
Is it stainless steel with bamboo handles. Just wash it in warm water with Dawn Dish soap then dry thoroughly. You can use scrubber sponge on stainless steel part if food is stuck on them. To keep bamboo handles from drying out & cracking keep it in zip lock baggies for storage. My mom had set from back in 1960's traveled all over the world with it, that how she cared for it.