Yeah that extra metal build up is strange and would confuse any number of collectors I'm sure. Your coin is still a really nice one, and probably worthy of having it TPG
'd. If you do slab it let us know what the grade ends up as, this
is a hard coin to grade from the photos alone.
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA
Life Member #3288 in good standing since 1982, EAC Member #6202, NBS Member, 2¢ variety collector.
See my want page: http://goccf.com/t/140440