Technically, there were two sightings in this episode, but one was so brief it barely counts. About 2 minutes into the 6th episode of season 6 entitled "For Immediate Release" Peter Campbell (Vincent Kartheiser) pours some Chivas for himself and Joan (Christina Hendricks). I've included the clip below even though the bottle wasn't really visible. A much clearer Chivas sighting took place at around the 16 minute mark when Peter pours from the same bottle. This is the 6th Mad Men scotch sighting so far, which isn't a lot considering how much alcohol is consumed on this show. This episode also features a hilarious scene involving a bottle of Canadian Club.