#188 Monaco...Thanks David!

The two triangular stamps were issued in 1953 featuring early and modern postal transports with the upper stamp showing Comet airliner and the lower stamp showing old monoplane.

The de Havilland Comet was the world's first commercial jet airliner to reach production.Developed and manufactured by de Havilland, it first flew in 1949 and was considered a landmark in British aeronautical design. After introduction into commercial service, early Comet models suffered from catastrophic metal fatigue, causing a string of well-publicised accidents.

The Comet had to be withdrawn and was redesigned. The Comet 4 series subsequently enjoyed a long and productive career of over 30 years, although sales never fully recovered. The Hawker Siddeley Nimrod, the military derivative of the Comet airliner, is still in service. The original decades-old airframes are being rebuilt with new wings and engines to produce the Nimrod MRA 4, expected to serve with Britain's Royal Air Force until the 2020s, over 70 years after the Comet's first flight.

A monoplane is an aircraft with one main set of wing surfaces, in contrast to a biplane or triplane. Since the late 1930s it has been the most common form for a fixed wing aircraft.

The 0.85 euro stamp is from 2008 Poster Art issue showing Monte Carlo Beach.