CZ 455 Canadian .22LR

Spent a good while surfing the net to find out about the rust coloured serial numbers. Can't find anything about it. Someone please help me out with some info. What should I do to protect the barrel and action from rust? I bought this thing as a wall hanger for my man cave and don't want it to rust at the serial numbers like one of my skss
http://imgur.com/f36dndA

I have a 455 Lux and it's clear the numbers were done after bluing, they have little burrs, but no rust on mine.
 
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