Okay, I did some buffing with rouge and I *think* it is silver-plated indeed - the non-exposed parts of the LH spatulas revealed intact and glossy plating with a silvery luster, but it's not nearly as beefy as with my Marigaux.
So okay, I assume it is silver then. The pitting, however, is really bad on some spots, I can't get no shinier than silky, with quite a bit of the underlying metal shining through.
After browsing around, I ordered some rub-on silver solution; if that doesn't work we have some other stuff in the house that might profit from a touch-up. It's substantially cheaper than an electroplating kit, food safe...we'll see.