Well jeez did you try google? I'm kidding, that's a real tough one.
Did I ever mention I'm a little ocd sometimes? After about 3 hours of research I was able to find a very similar product.
http://www.mill-max.com/images/products/pdf/114N.PDF
Looks to me like the socket part of the pin is likely gold plated, and the pin portion is tin or tin/lead.
Couple other things:
1 - you will almost never find silver coated pins like that. Silver oxidizes too easily which makes it a lousy choice for anything electrical that is exposed to open air. It is used in sealed units like relays, switches, breakers, etc.
2 - I trying to find out what that was made of I came across some pins that are made of nickel or a nickel / boron mix. Just one more possibility to consider in future metal pin id.
Hope that helps some.
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