On Friday, I put on a set of the nickel SBs that I had purchased about 5-6 months ago from BSO. Strangely, the A string had a silver ball end as opposed to the normal brass colored ball end. There was nothing else different about the string and it sounds and plays fine. But I'm wondering, is there some kind of contest I don't know about? Have I won a lifetime supply of strings from Dunlop for finding the "silver ticket"?

Seriously though, has anyone else ever seen this in a set they have purchased...A string or otherwise?