Negative ion photoelectron spectra of NiCu-, NiAg-, NiAg2-, and Ni2Ag- are presented for electron binding energies up to 3.5 eV. The metal cluster anions were prepared in a cold cathode de discharge flowing afterglow source. The dimer spectra exhibit three low lying electronic states; the ground electronic states are vibrationally resolved. The dimer electron affinities are determined to be EA(NiCu)=0.889+/-0.010 eV and EA(NiAg)=0.979+/-0.010 eV. Two excited state electron configurations are assigned as (d(Ni)(8)d(Cu)(10)sigma(2) sigma(*1)) and as (4) Delta (d(Ni)(9)d(Cu)(10)sigma(1) sigma(*1)). The NiCu- ground state is assigned as (3) Delta (d(Ni)(9)d(Cu)(10)sigma(2) sigma(*1)), and has a vibrational frequency of 235+/-25 cm(-1). The photoelectron spectrum of NiAg- strongly suggests that the electronic configurations of the three observed states are the same as those of NiCu-. The NiAg ground state vibrational frequency is 235+/-25 cm(-1) and the NiAg- frequency is 185+/-25 cm(-1). The chemical bonding in both NiCu and NiAg dimers is dominated by a s sigma molecular orbital, and the extra electron in the anions has primarily s sigma* character. The photoelectron spectra of the trimers, NiAg2- and Ni2Ag-, are remarkably similar to those obtained for the coinage metal trimers, and are consistent with a transition between a linear anion ground state and a linear excited state of the neutral.