1915 Buffalo

This is my nicest Buffalo. What's with the diagonal stripes/discoloration?

 

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Judging from the pics it could be toning...which is common on older coins which were stored in materials and locations which cause this...its less common on modern coins because the materials for storing (i.e. pvc free, air-tite capsules, etc.) are better and most folks now days know to keep their coins away from the flooded basement

 

I would guess you have a woody - improper alloy mix. See https://www.cointalk.com/threads/got-wood.65353/

 

I thought the "woody" look only happened with cent coins...

 

Here are a couple examples from that thread. Woodies are from improper alloy mix. Nickels are alloys (75% copper and 25% nickel).

 

Nice is right Trussel. That is a very fine looking Buff. Too bad about the minor nicks on the Obv., otherwise it might grade as an UNC.

Dave