I ran across a batch of NOS spinners years ago ....
one "blade" was bare aluminum color and one blade was annodized red.
They still had Wayne tags on them from the factory.
when looking at them, 12 and 6 o'clock was red , 9 and 3 o'clock was aluminum.
All the ones I have seen that have come out of pumps had lost the annodizing, due to sunlight or chemicals in the gas maybe?

Veeder Root Rebuilds.....since 1987
Veeder Root Identification CD
Gas Pump Clock Repair
jkyocom@bellsouth.net