Lifetimes have been measured in 1 3 9 Sm with the DSAM method, using the reaction 6 2 Ni( 8 1 Br,p3n) 1 3 9 Sm at 350 MeV. In the negative-parity regular dipole band based on the 25/2 - state at 3325 keV values of 0.60(21), 0.40(14) and 0.25(8) ps were found for the 337, 409 and 473 keV transitions, respectively. The deduced B(M1) and B(E2) are in agreement with the predictions of the tilted axis cranking model, allowing a triaxial equilibrium shape for the assumed νh 1 1 2 πh 2 1 1 2 configuration.