Jurançon is Manseng country, and Manseng is what Chateau Lafitte works with.
The Jurancon Sec 2017 is dry, a blend of Gros Manseng and Petit Manseng. The Orange Jurançon Amphora is Petit Manseng on its own, made in amphora and bottled at 500ml. Both appear below when they are in, which depends on the vintage.