Mengenlehreuhr

After the Senate decommissioned it in 1995, the clock was relocated to a site in Budapester Straße in front of Europa-Center, where it stands today.

The Mengenlehreuhr clock face utilizes 24 light switches (1+4+4+11+4=24) to display time in 0-24 hour, 0-59 minute and even/odd second.

The upper row also have 3 unique colored light, representing the minute mark at 3*5-minute intervals of 15, 30, 45.

Therefore the time is 10:31:odd-second(1-59) This clock may be the key to the unsolved section of Kryptos, a sculpture at the CIA headquarters.

After revealing that part of the deciphered text of the sculpture, in positions 64-69, reads "BERLIN", the sculptor, Jim Sanborn, gave The New York Times another clue in November 2014, that letters 70–74 in part 4 of the sculpture's code, which read "MZFPK", will become "CLOCK" when decoded,[1] a direct reference to the Berlin Clock.