Can purchase these augmented from the Dominion Tactician in Abyssea-Uleguerand for 1000 dominion notes.
Augments I've seen so far include combinations of DMG+1~4, crit. hit rate +1~3, resist petrify +1~5, backhand blow dmg:+10~20%. I received a pair with DMG+3 crit hit rate +3.
With max fame NPC’s for 7,012 each. It should be noted if buying these with Dominion Notes to NPC for gil that the Polearm Guisarme from Abyssea-Altepa and the Great Katana Yukitsuga from Abyssea-Grauberg sells for the most tied at 7,152 each with max fame.