Rashi on Numbers 7:86/רש"י על במדבר ז׳:פ״ו

1כפות זהב שתים עשרה THE GOLDEN SPOONS WERE TWELVE — Why is this stated at all, since we have been told that twelve princes brought each one spoon? But because it is stated in each instance: “one spoon עשרה זהב”, I might explain it either as meaning: it was of gold but its weight was ten shekels of silver, or, perhaps, not so, but it means: one spoon of silver and the weight thereof ten gold-shekels — and the gold-shekels have not their weight equal to those of silver-shekels — Scripture therefore states here, “golden spoons” — the spoons themselves were of gold ( Sifrei Bamidbar 55).