Secondhand GPU Block - Nickel Plating issue

[Zom]

I'm happy with my CPU AIO cooler but I'm looking to do a simple GPU loop as a first foray into watercooling. I've found a cheap second hand Waterblock (pic below) which I'm thinking of buying but it has signs of Nickel plating wearing off (common for EKWB I think). is this too bad to be usable or should it be ok from a performance and leakage perspective?

 

[jigger]

Other not looking great, it should be fine with a good clean assuming everything else is in good shape.

 

[WARburton]

its doesn't look amazing but should be fine if the oring is good.
it look like it been run for a long time, what gpu is it for?

buy a pressure tester, best thing i ever did you know if it will leek before you put water in it