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Heiloscope made by Ertel & Son, Munich. The helioscope is a telescope for viewing the sun without injury to the eyes, by means of blackened glass on mirrors that reflect only a part of ...
i m from India .i also have one of this tin,i want to sale this item so kindly inform me by Email.
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I believe this coin was artificially darkened at minting. I am not sure what periods this ocured except I think a 1906 coin I have was treated this way