Optical/Stark measurements have been performed on the (0,0) bands of both the A(') (1)Sigma(+)-X (1)Sigma(+) system (nu(0)approximate to 12 643 cm(-1)) and the A(') (1)Pi-X Sigma(+) system (nu(0)approximate to 13 196 cm(-1)) of platinum monocarbide. The PtC molecules were produced in a pulsed supersonic molecular beam source following the reaction of laser ablated platinum vapor with a mixture of a few percent of methane in argon. The newly determined permanent electric dipole moments obtained are 1.94(2)D (A" (1)Sigma(+)) and 1.919(9)D (A' (1)Pi). These results are discussed in terms of a proposed molecular orbital correlation diagram for platinum containing diatomics. The laser-induced fluorescence spectrum of the (0,0)A(') (1)Sigma(+)-X (1)Sigma(+) transition of PtC has been re-recorded at high resolution (full width of half-maximum similar to 40 MHz) and analyzed to yield rotational constants for the four most abundant isotopomers of PtC, extending the previous analysis [Appelblad, Nilsson, and Scullman, Phys. Scr. 7, 65 (1973)]. The anomalously large value (similar to 15 MHz) for the newly derived nuclear-spin rotation parameter, C-I(Pt-195), for the A" (1)Sigma(+) state is discussed.