Nice coins. You sure have some nice neighbors.
I'm that last person who should give advise about coin cleaning. Every time I try electrolysis, my quarters turn from dirty silver to a coppery-pink. They get clean but look like giant pennies.
You know (yeah - here I go - I wouldn't listen if I were you) Beefcake has been recommending Mr. Clean's Magic Eraser to clean tarnish from silver. Don't know how it would work on that, but it's just an idea.
HH
Rich