I've searched hundreds of BU rolls of 55-S and have seen a few of these in them. After 70 years in a BU roll environment, they tend to have green and salmon pink toning, and show good luster just like any BU coin. After time in circulation or similar environment, those colors tone to different shades of brown and give the "woody" appearance. I'm not sure what the alloy issue was, maybe just mixing, but I don't see this at all on 55-P or 55-D coins so it must have been just for the supplier who provided planchets for the SF mint. A similar thing happened during the WW2 years with the "shellcase" Cents, where mainly/only the S-mint coins showed a lot of this streaking. Same supplier?
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