A fact from Stock im Eisen appeared on Wikipedia's Main Page in the Did you know column on 3 July 2010 (check views). The text of the entry was as follows:
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They are of varying periods, but most are 18th and 19th century. A few must be medieval, because research showed the first were put in the tree before it was felled, i.e., before 1440. Yngvadottir (talk) 05:14, 11 January 2015 (UTC)[reply]