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Old 9th October 2018, 03:48 PM   #3
corrado26
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Join Date: Dec 2014
Location: Black Forest, Germany
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I think these are no rivets but some modern screws that need a special tool to turn them. These in combination with the gothik (German?) letter "G" let me think of the end of the 19th, beginning 20th century.
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corrado26
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