Thanks Fernando and Jim.
Indeed, it is Bingo, as this city is currently the capital of Europe !
In fact, I have had access to a bank of more than 15,000 original German coat-of arms of the 17th century (see below the link to some of the coat-of-arms, which shows the coat-of-arms of Strassburg (Strasburg or Strasbourg), free imperial city of the Holy Roman Empire (top right):
http://upload.wikimedia.org/wikipedi...bmacher219.jpg
For information, the vertical lines are always representative of the red color according to general heraldry.
Because the executioner's sword was dated to 1670 by several experts, it can be attributed to Johann-Michael Grosholtzen (Jean-Michel Grosholtz), executioner of Strasburg from 1670 to 1686 (the city was about 26,000 people at that time). Many poor guys were likely beheaded with this executioner's sword.... as evidenced by looking at the blade