Before reading the above posts my first impression was "it looks more like the plating is wearing off" than toning.
Malaysia. 1969, KM#7, Ringgit denomination, metal-copper-nickel, mintage-1,000,000 not rare at all. grade/value VF-$1.50 XF-$3.50 MS-60-$5.00 MS-63- $7.00 MS-65-$10.00 guessing value is $1.00 after someone damaged it with trying to gold plate it.