IT's not Oseberg silk, it's not even Persian silk! C6th–7thAD Silk twill textile, woven in Japan, imitating a Sasanian Persian original, from the Shoso-in Depository in Nara (established 754 AD).
Liao Dynasty. The weave structure is typical Liao samite, but the design retains the influence commonly found in the Tang dynasty. The pattern consists of pearl roundels enclosing four birds in symmetrical arrangement. This is a combination of a Song dynasty grid system popularly known as cu si (group of four in tangential arrangement) and a Central Asian motif of the bird in roundel. The use of pearl roundels is also popular in Liao textiles. China National Silk Museum.
鳥毛篆書屏風 第5扇 第6扇 正倉院
Yuan Dynasty. Cloth of gold with winged lions and griffons. Silk, gold thread; lampas weave. The motif of confronting lions in a medallion is constructed as a horizontal point repeat design unit of one half the image, flopped to compose the single medallion. This unit is then used as a straight repeat vertically. 124 x 48.8 cm. Purchase from the J. H. Wade Fund. The Cleveland Museum of Art.
ancient mirror in Syosohin museum in Nara,Japan.@螺鈿鏡
唐 紫地團花紋“正倉院”錦<br/>Textile with Floral Medallion
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Date: 13th–14th century Century: 13th Century AD Media: Silk, Silver; Lampas Dimensions: 61.4 x 61.4 cm (24 3/16 x 24 3/16 in.) Department:Costume and Textile Arts Object Type: Fragment Country: Turkey Continent: Asia Culture/People: Seljuk Period Accession Number: 1999.182.11 Pattern of endless knot design with a pointed upper loop. Gold metallic weft on dark gray ground. Mounted on tan background on rigid frame.