The cheaper Anastigmat 135mm f6.8 lenses were often triplets although some where Doppel Anastigmat, few would have been up to the quality of a Dagor.
Judging by the OP's image taken with the lens and the fall off at the corners it may well be an Triplet.
All manufacturers offered 9x12 cameras with a variety of lenses and shutters, the best models used Tessars, Heliars, Xenars, Eurynars, Dagors etc in Compur or Ibsor shutters, then with the cheapest lenses a 3 speed Vario or Derval shutter which is what appears to be on this particular camera.
Ian



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