What does this confusion mean? (65), Francisco Goya

What fuss is this? Object Type: etching print. Dimensions: height: 145 mm (5.70 in); width: 210 mm (8.26 in). Medium: aquatint, etching and polishing. Collection: Statens Museum for Kunst. Francisco de Goya, Hvad betyder denne forvirring 65 , , KKSgb5100-25, Statens Museum for Kunst