Biggest coin I have found!

VERY Interesting but I wonder if you know cleaning copper coins with electrolysis devalues the coin a wash in soapy water is about all you really should do.  I had some internment camp coins and I foolishly cleaned them much to my regret untouched they would of been worth $70 each... messed about with $10.  We all learn by our mistakes.  Silvers easy to clean copper leave it alone.

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Keep it up.....should be more with luck

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Nice 5 Kopeck specimen.  Indeed, they're big

I have 4 of these in my numismatic collection.  They retail for about $25-$35, sometimes higher depending on grade.

BTW, olive oil is a good way to loosen dirt, cake, and grime.  Also works is soaking with 100% pure acetone in a glass dish, with no exposure to sunlight, and alternating with rinses in distilled water.  Anything else, or harsher handling, most probably will reduce/damage numismatic value.

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