Tower Clocks of Russia.

Russia released a set of 4 stamps on clocks in continuation of the series "Monuments of science and technology" on 16 May 2011 dedicated to the Clock towers of Russia.

The stamps depict the following tower clocks:
1. The clock on the Central Telegraph building. Moscow.
2. The clock on the building of the Admiralty. St. Petersburg.
3. The clock on the building of Moscow State University. University. Moscow.
4. The clock on the building of the railway station. Sochi.

In Russia the first mechanical clocks were installed in the Kremlin in 1404. They had a rotating dial with a stationary arrow. Clock tower at Frolovska (Saviour) Tower of Moscow Kremlin appeared in the XVI century.