Color enhanced image so it's hard to tell.
The metal could turn greenish (See Statue of Liberty), but not green like that.
If I had to guess, I'd guess ink. Metal-free T205s are seen from time to time, but it's usually yellow underneath not green. My guess is they used yellow to match the then shiny penny metal.
Last edited by drc; 10-10-2012 at 01:12 PM.
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