Seal of the Exemplar
Can be obtained from drop loots within any T2/T3 RvR lake by killing players with Min Rank 16, Zone locks or from quest The Gears of WAR! from High Pass Empire WC and quest The Gifts of WAR! from Talabecland Chaos WC or from quest WAR is Upon Us! from Troll Country Empire WC and quest This is WAR! from Ostland Chaos WC.
Potion of acclaim can be bought with both of the currencies or only with Seal of Exemplar.
Troll Country Empire WC NPC : Warmaster of Sigmar 39k/61k
Ostland Chaos WC NPC : Herald of Khorne 28k/3k
High Pass Empire WC NPC : Engineer Balinor 32k/56k
Talabecland Chaos WC NPC : Herald of Nurgle 22k/66k