Fairly easy yes. If you do all the available hunts per day you will earn 5x3 + 5x4 + 5x15 = 110 seals per day. Plus another 100 per week for the Elite mark. Total of 870 seals per week.
Some additional seals if you participate in killing Rank A or Rank S marks.
It will take a bit of time to get enough seals for a full set, but at level 60 it is not hard.