simply because I love the watch and given the scarcity of the TA version - whether original or Bienne NOS, I try to purchase the watch. It is a solid watch, incredibly well made, and in my humble opinion is one of the great bargains in vintage omegas. For a watch with its qualities - rare (in TA guise), military, antimagnetic, forerunner of the railmaster - it is still a bargain I think.