2011 AD., Germany, Hamburg old Elbtunnel anniversary commemorative, Hamburg mint, 10 Euro, KM 302.

Germany, Federal Republic, Hamburg old Elbtunnel anniversary commemorative, engraver: Otto Herwig, Hamburg mint ("J"), 2011 AD., issue date: 01/12/2011,
10 Euro (ø 32,5 mm / 13,97 g), copper-nickel (CuNi25), 14,00 g theor. mint weight, mintage 1.700.000 , axes medal alignment ↑↑, plain, incuse lettered edge,
Obv.: F / BUNDESREPUBLIK / DEUTSCHLAND 2011 / 10 / EURO , mint mark "J", issuer and value below German national emblem eagle, 12 stars of Europe flanking.
Rev.: 100 / Jahre / HAMBURGER ELBTUNNEL , section of a building with internal stairway and a lift, parts of the tunnel below the Elbe in Hamburg, two ships shown left.
Edge: plain with incuse inscription "VERBINDUNG VON STADT UND HAFEN ~ ~ " (connection between the city and it´s harbour).
KM 302 .

Year / Mint Mark / Mintage
2011 / J / 1.700.000
(plus a similar proof issue made of 0.625 silver)

Old Elbe Tunnel or St. Pauli Elbe Tunnel (German: Alter Elbtunnel (coll.) or St. Pauli Elbtunnel (official name)) which opened on 7 September 1911, is a pedestrian and vehicle tunnel in Hamburg, Germany. The 426 m (1,398 ft) long tunnel was a technical sensation; 24 m (80 ft) beneath the surface, two tubes with 6 m (20 ft) diameter connect central Hamburg with the docks and shipyards on the south side of the river Elbe. This meant a big improvement for tens of thousands of workers in one of the busiest harbours in the world.
Four huge lifts on either side of the tunnel carried pedestrians, carriages and motor vehicles to the bottom. They are still in operation, though due to the limited capacity by today's standards, other bridges and tunnels have been built and taken over most of the traffic.

more on https://en.wikipedia.org/wiki/Elbe_Tunnel_%281911%29