Weird tarnish on a 1910 Straits Settlements 10 cents (If it is real) [solved]

Greeting fellows, I got a Straits Settlements 10 cents which minted in 1910, with a male crowned bust faced right.
The size are correct (according to www.ngccoin.com) and it don't stick to a magnet. But the tarnish in this coin seem to be a little bit weird....while rest of the coin did have a quite common grey-or-black tarnish, but the center of the reserve (By the way,it seem like damaged ) have a light yellow-golden tarnish (might be unclear on the picture,but I did saw it)... that's make the coin "funny", more or less.
So does it normal/at least did have a chance to found that a coin have tarnish like this example?
Thank you for your helps. And sorry for my awful english

From the pictures they look ok.

Propably has the coin been 'glued' in a catalog, or it has been in contact with other coins.

Quote: "KLiao"​From the pictures they look ok.

​Thanks you :)

Quote: "PetrusAscanus"​Propably has the coin been 'glued' in a catalog, or it has been in contact with other coins.

​So... this coin were removed from a catalog in a "not so gentle" manner, otherwise it has been stacked with other coin....(They are both make sense as it had been in a stack of assorted coin when I saw it)
Anyway, thank you :)