A close-up view of a pre-Inca, Paracas textile calendar, which is one of the four artifacts repatriated from Gothenburg, Sweden, is shown to the media in Lima on Monday. Mariana Bazo / Reuters

A rare and fragile pre-Incan funeral shroud was displayed to reporters on Monday, part of the first batch of ancient Paracas textiles that Sweden is returning to Peru 80 years after they were smuggled out by a diplomat.

The intricately colored shroud, measuring 104 cm by 53 cm, and 88 other textiles were donated to a museum in Gothenburg in the early 1930s by Swedish consul Sven Karell. He had secreted them out of Peru after they were discovered in the Paracas Peninsula, a desert south of Lima where the extremely dry climate helped protect the Alpaca wool fibers.

Despite being 2,000 years old, "it is perfectly preserved", said Krzysztof Makowski, a University of Warsaw archaeologist who has studied the shroud as a professor at the Catholic University of Peru. "Across the world, the discoveries of textiles of this age are much rarer than any precious metal.

"If you wanted to find a Roman textile, you won't find anything because nothing was preserved," Makowski said. "Textiles are very fragile. There are very few countries in the world that have conserved fabrics. Peru is one of them."

The so-called Shroud of Gothenburg is uniquely complex. It includes some 80 different color tones and subtones such as blue, green, yellow, red and orange. It is divided into 32 frames decorated with items resembling condors, frogs, cats, corn, cassava and humanlike figures. Some researchers believe the shroud may be a sort of calendar related to the tracking of farming seasons, said Jahl Dulanto, an archaeologist at the University of Illinois at Urbana-Champaign who leads the Paracas investigation team at the Catholic University of Peru.

Dulanto said experts still do not fully understand how the shroud's creators achieved the combination of sewing techniques and pigments.

The shroud and three other pieces were flown to Peru last week, fulfilling a friendly agreement reached with the Museum of World Culture in Gothenburg in 2013. The rest of the Paracas textiles will return to Peru over the next seven years.

Peruvian officials have been working to reclaim its cultural antiquities from other countries. In June, it recovered more than 3,800 pre-Incan items held in Argentina. In 2011, Yale University returned 366 pieces from the Incan city of Machu Picchu that it had held for more than a century.