Question: When did the currencies of the nation, where the archaeological site of Chibuene is found, first come into circulation?

full_context: Document 1: Cape Verdean escudo: In mid-1998 an agreement with Portugal established a pegged rate of 1 Portuguese escudo = 0.55 Cape Verdean escudo. Since the replacement of the Portuguese escudo with the euro, the Cape Verdean escudo has been pegged to the euro at a rate of 1 EUR = 110.265 CVE. This peg is supported by a credit facility from the Portuguese government.
Document 2: Spanish peseta: The peseta was replaced by the euro in 2002, following the establishment of the euro in 1999. The exchange rate was 1 euro = 166.386 pesetas.
Document 3: Euro: The changeover period during which the former currencies' notes and coins were exchanged for those of the euro lasted about two months, until 28 February 2002. The official date on which the national currencies ceased to be legal tender varied from member state to member state. The earliest date was in Germany, where the mark officially ceased to be legal tender on 31 December 2001, though the exchange period lasted for two months more. Even after the old currencies ceased to be legal tender, they continued to be accepted by national central banks for periods ranging from several years to indefinitely (the latter for Austria, Germany, Ireland, Estonia and Latvia in banknotes and coins, and for Belgium, Luxembourg, Slovenia and Slovakia in banknotes only). The earliest coins to become non-convertible were the Portuguese escudos, which ceased to have monetary value after 31 December 2002, although banknotes remain exchangeable until 2022.
Document 4: Mozambique: Mozambique (), officially the Republic of Mozambique ( or "", , , , ), is a country located in Southeast Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west, and Eswatini (Swaziland) and South Africa to the southwest. The sovereign state is separated from the Comoros, Mayotte and Madagascar by the Mozambique Channel to the east. The capital of Mozambique is Maputo (formerly known as "Lourenço Marques" from 1876 to 1976) while Matola is the largest city, being a suburb of Maputo.
Document 5: Sa Caleta Phoenician Settlement: Sa Caleta Phoenician Settlement can be found on a rocky headland about 10 kilometers west of Ibiza Town. The Phoenicians established a foothold around 650 BC. On this site archaeologists have discovered the remains of simple stone buildings. The discovery is so important that the site has been designated a World Heritage Site.
Document 6: Kingdom of Butua: The Kingdom of Butua or Butwa (c. 1450 - 1683) was a pre-colonial African state located in what is now southwestern Zimbabwe. Butua was renowned as the source of gold for Arab and Portuguese traders. The region was first mentioned in Portuguese records in 1512.
Document 7: Salvadoran colón: The colón was the currency of El Salvador between 1892 and 2001, until it was replaced by the U.S. Dollar. It was subdivided into 100 centavos and its ISO 4217 code was SVC. The plural is colones in Spanish and was named after Christopher Columbus, known as Cristóbal Colón in Spanish.
Document 8: Cape Verdean escudo: After independence on 5 July 1975, notes were issued for 100, 500, and 1000 escudos on 1 July 1977. The next series of notes was introduced in 1989 and consisted of 100, 200, 500, 1000 and 2500 escudos.
Document 9: Chibuene: Chibuene is a Mozambiquean archaeological site, located five kilometres south of the coastal city of Vilanculos South Beach. The site was occupied during two distinct phases. The earlier phase of occupation dates to the late first millennium AD. The second phase dates from around 1450 and is contemporaneous with the Great Zimbabwe civilization in the African interior. During both phases of its development Chibuene was a trading settlement. Trade goods obtained from the site include glass beads, painted blue and white ceramics, and glass bottle fragments. The later phase of settlement has yielded remains of ancient structures as well as evidence of metallurgy. Crucibles have been found that were presumably used to melt gold obtained from trade with the Great Zimbabwe civilization. There is evidence that Chibuene traded extensively with the inland settlement of Manyikeni. Mozambique has jointly inscribed these two properties on their tentative version of the World Heritage List.
Document 10: Plymouth: Upper Palaeolithic deposits, including bones of Homo sapiens, have been found in local caves, and artefacts dating from the Bronze Age to the Middle Iron Age have been found at Mount Batten showing that it was one of the main trading ports of the country at that time. An unidentified settlement named 'TAMARI OSTIA' (mouth/estuaries of the Tamar) is listed in Ptolemy's Geographia and is presumed to be located in the area of the modern city.
Document 11: Zimbabwean dollar: The first Zimbabwean dollar was introduced in 1980 and replaced the Rhodesian dollar at par. The initial ISO 4217 code was ZWD. At the time of its introduction, the Zimbabwean dollar was worth more than the US dollar in the official exchange market, with 1 ZWD = 1.47 USD, although this did not reflect the actual purchasing power it held. As a result, in both the official and parallel markets, the currency's value eroded rapidly over the years, and by July 2006, the parallel market value of the Zimbabwean dollar fell to Z $1,000,000 = GB £1.
Document 12: Mozambican metical: The metical (MZM) replaced the escudo at par on 16 June 1980. It was divided into 100 centavos. The metical underwent severe inflation. After the revaluation of the Romanian leu, the metical briefly became the least valued currency unit, at a value of about 24,500 meticais per USD, until the Zimbabwean dollar took the title in late August 2005.
Document 13: Bilene: Bilene, also known as Praia do Bilene, is a town in southern Mozambique, lying 140 kilometres northeast of Maputo in the province of Gaza. It is known as a beach resort, lying on the Mozambique Channel. Noted for its calm and clear lagoon, the Uembje Lagoon, giving way to the pounding Indian Ocean beyond tall dunes, it is reported to be the closest beach destination to the city of Johannesburg in neighboring South Africa.
Document 14: Manica, Mozambique: Manica is a market town in western Mozambique, lying west of Chimoio in the province of Manica. Originally the centre of the Kingdom of Manica, it grew around the gold trade but is now best known for the Chinamapere rock paintings. The Penha Longa Mountains lie north of the town.
Document 15: Coins of the Indian rupee: The move towards decimalization was afoot for over a century. However, it was in September, 1955 that the Indian Coinage Act was amended for the country to adopt a metric system for coinage. The Act came into force with effect from 1 April 1957, after which anna and pice denominations were demonetised. The rupee remained unchanged in value and nomenclature. It, however, was now divided into 100 'paisa' instead of 16 annas or 64 pice. Effective from 30 June 2011, all coins in denominations of 25 paisa and below were officially demonetized.
ground_truth: 16 June 1980
sub_queries: Chibuene >> country Answer: Mozambique
when did the currencies of Mozambique first come in circulation Answer: 16 June 1980