Those fans:
Bart, the metal fan is indeed painted "whale tusk white" and it is not plated. They were not properly balanced from the factory and at the higher revolutions offered by the engine, in a sports car, had a tendency to cause undue wear to the water pump bearings. By the way they are constructed, they had a tendency to throw a blade causing significant damage. That's why they were replaced with the nylon fans. The nylon fans flexed and self balanced and they didn't throw blades.
If you plan to use the metal fan system, I highly recommend that you have it balanced and inspected for metal fatigue at the rivet joints. When you have your example balanced, you will be able to determine if the one blade you refer to is sanded for that purpose or not. If it is, then don't let anybody give you any crap for it!