Raadsel / Riddle



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What is on the twelfth photo?

If you know the answer, the best way to prove it is to send me your own photo.
You can also tell me what is on the photo, but you better be very sure your answer is correct.

Posted August 23, 2016.

First answer received May 24, 2017, from Tim Weenink.
Second answer received Jan. 5, 2018, from Bor de Kock.