I have the same pair. They are very nice looking with the MOP handle and sterling collar. The blade is silver plated, so normally you could polish it with a jewelry cloth. Be careful not to get any type of jewelry cleaner, or contact the jewelry cloth, to MOP or soft stones, like turquoise.
I see some rust on the one blade, so that will make polishing a bit hard. Maybe it it with some copper wool. Be very detailed to target the rust and not damage the silver plating.
If you don't plan to use them then oil it up to prevent re rusting.