Does anyone know anything about G & H Ferte Armagnac?

I might have the opportunity to buy a bottle of G & H Ferte Armagnac in the near future, but trying to look it up leads me nowhere. There's some sites that have it in stock, but these are just shop listings with very little information about the spirit itself or the history behind it. Google and Brave's search engines seem to confuse it a lot with Ferte de Partenay as well.

https://www.wine-searcher.com/find/g+h+ferte+vintage+armagnac+france

https://www.jonquet.com/lot/149846/25935409-bouteille-darmagnac-g-et-h-ferte-proprietaire-au-chateau-de

https://www.bonhams.com/auction/22887/lot/418/g-et-hferte-1896-armagnac/

https://millesimesalacarte-wineshop.com/spiritueux/1029-spiritueux-armagnac-1950-g-et-h-ferte-de-partenay-40-70-cl.html