B.V.B Pick FX7 China 100 Yuan 1979 VF+ Foreign Exchange Certificate. GREAT WALL.

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Great Wall of China

Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of China to protect the Chinese states and empires against the raids and invasions of the various nomadic groups of the Eurasian Steppe. Several walls were being built as early as the 7th century BC; these, later joined together and made bigger and stronger, are now collectively referred to as the Great Wall. Especially famous is the wall built 220–206 BC by Qin Shi Huang, the first Emperor of China. Little of that wall remains. Since then, the Great Wall has been rebuilt, maintained, and enhanced; the majority of the existing wall is from the Ming Dynasty (1368–1644).

Other purposes of the Great Wall have included border controls, allowing the imposition of duties on goods transported along the Silk Road, regulation or encouragement of trade and the control of immigration and emigration. Furthermore, the defensive characteristics of the Great Wall were enhanced by the construction of watch towers, troop barracks, garrison stations, signaling capabilities through the means of smoke or fire, and the fact that the path of the Great Wall also served as a transportation corridor.

The Great Wall stretches from Dandong in the east to Lop Lake in the west, along an arc that roughly delineates the southern edge of Inner Mongolia. A comprehensive archaeological survey, using advanced technologies, has concluded that the Ming walls measure 8,850 km (5,500 mi). This is made up of 6,259 km (3,889 mi) sections of actual wall, 359 km (223 mi) of trenches and 2,232 km (1,387 mi) of natural defensive barriers such as hills and rivers. Another archaeological survey found that the entire wall with all of its branches measure out to be 21,196 km (13,171 mi).

Source: https://en.wikipedia.org/wiki/Great_Wall_of_China

Foreign exchange certificate

A foreign exchange certificate, sometimes abbreviated to FEC, is a tool for foreign exchange control in countries where the national currency is subject to exchange controls or is not convertible. The arrangements vary significantly case by case. Some of the main types of FEC are:

• A certificate for purchasing foreign currency at a specified rate, often for a specified purpose, such as financing imports. This type of certificates were required in many European countries after World War II.
• A certificate denominated in local currency, which the foreign citizens are required to use for some or all of their purchases. The exchange rate may be more favourable for the visitor than the official commercial rate. The purpose is to channel the foreign exchange to the state coffers instead of the black market. This type of FEC's were in use in China in 1980–1994.
• A certificate denominated in foreign currency, to which the local citizens are required to exchange any foreign currency they manage to get possession of. These certificates may be accepted as payment in specific stores, which otherwise sell goods only to foreign citizens in exchange for foreign currency. This type of FEC's were applied in the Soviet Union in 1961–1991.

Some countries which have employed FEC's or similar arrangements under some other name in the past include:

• Soviet Union
• China
• Myanmar (Burma) (until March 2013)
• East Germany (forum checks, pegged to the West German Deutsche Mark)
• Nazi Germany
• Ghana – it was illegal to import and export Ghanaian cedi banknotes (around 1980)
• North Korea
• Cuba (Today's convertible peso, to an extent, is a form of FEC)
• Czechoslovakia (Tuzex)
• Bulgaria (Corecom)
• Poland

Source: https://en.wikipedia.org/wiki/Foreign_exchange_certificate