DAO medal

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Dear friends, one man is interested in two badges from my collection. I am 100% sure that the badges are original, but my client has doubts because such badges are rare in Russia. I would be grateful if you can say your opinion them. See photos below. Thank you!

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Skan

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Skan

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Skan

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Photo

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Skan

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Photo

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Photo

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Photo2

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Dear friends,
Can you please give me the acceptable range of dimensions of original badge. So I could compare with my badge.