Advent Riddle: Manhole-Heraldry

The history of the sewerage can be traced back to antiquity. The founded in 1874 Berlin network, today reaches nearly 10,000 pipe meters, 243 894 removable plates are covering access points for underground pipe maintenance. Like many other municipalities, Berlin has its own cover design.
In our this year’s Advent riddle, we ask to identify the origin of manhole covers shown below.

Please send your solution to buero@archivauskunft.de until  January 1st, 2018, 12.00 pm CET.

The winner has free choice in the current offer of the raubdruckerin online shop.
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