Soul 1988 Olympiad silver coin.

Hi.

I got 57 USA memorial coin and trying to identified them.

These two are odd? Color is more yellow kind another in picture left side.
and weigh is 27.1gr and more silver color coin is near right weigt 26.8gr

Is that chinese copy ? aargh.

3 pictures at same coins in different angles. i precited any help i can get.

 

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Forget mention that i made "bling" test to coins and both coins seems to get silver noice.

 

Pictures aren't good enough to tell much. Most likely the one on the left is just toning.

 

I try get tommorrow better picture. Yes like it tuning somehow ? but is it normal or fake and why tuning? and how ?

 

I take new pictures now.

It seems to be someking coating at more yellow one coin? I just bought 47 one dollar coin on dealer and there is some coins in double and that kind of coating coins ??

Can anyone help on me this, is yellow one coin fake or real ? I pay 25euros on it and have severals.

Does http://en.wikipedia.org/wiki/Renaissance_Wax do that kind coating or is it just fake coin.

pls. help me.

First picture is real one, i hope but color is more autentic.
Second odd color.
Thirt real.
Fourth left real , right odd color.
Fifth left odd color , right real.

 

Anyone helps ?