High resolution spectra in the 12,2 mu m region of the upsilon(12) fundamental of the minor isotopomer (CCH6)-C-13-C-12 have been recorded. Torsional coriolis interaction of the excited upsilon(12)=1 state with the close lying excited torsional upsilon(6)=3 State leads to observed splittings of up to several tenths of cm(-1) in upsilon(12) near the crossing region at K Delta K=-18. Torsional splittings measured with a high resolution tunable diode spectrometer (TDL) and more than 2200 lines measured with a Fourier transform spectrometer (FTS) have been analyzed in a global nonlinear least squares fit to a symmetric top Hamiltonian. The standard deviation of the overall fit is 5.5X10(-4) cm(-1). From 17 intensity measurements of individual lines, a square dipole moment of R(upsilon)(2)=7.45(29)X10(-4) D-2 has been derived for the upsilon(12) fundamental.