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The spots are located in the bottom left half of the reverse next to the lion. There is also some doubling visible on the rook or castle in the bottom right quadrant of the reverse.
ChristianN, it is not uncommon for a genuine coin to have some silver remnant left on field of a coin and had been double-struck in some areas. Frankly, I don't think your coin has a problem. Congratulation to have a nice historical coin collected. Always started from simple and useful information, can you also tell the weight and diameter of your coin.
I have the same year coin and it is 26.67 grams (std. wt. 27 grams), 39.4-39.5 mm, S.G. measured by me 10.25 (about 85% Ag). I am confident that my coin is real. There are pictures for you to compare. Henry


