  We present a spectral and timing study of the High Mass X-ray Binary
transient source 4U 1700-37 using NuSTAR and ASTROSAT/LAXPC. The source is
observed in two different flux states. A combined spectral analysis of NuSTAR's
FPMA and FPMB shows the possible hint of a cyclotron line feature at $\sim$16
keV. The line feature is consistently present in different continuum models
with at least 3$\sigma$ confidence level. We do not detect the presence of a
previously reported ~39 keV cyclotron line in the combined spectra. A $\sim$16
keV cyclotron feature would suggest that the compact object is a neutron star
with a magnetic field strength $\sim2.1\times$10$^{12}$ Gauss in the emission
region. We also find the presence of a rare Ni $K{\alpha}$ emission line around
7.6 keV in the NuSTAR spectrum. We searched the NuSTAR and ASTROSAT data for
coherent or quasi-periodic oscillation signals but found no evidence in the
frequency range 0.1 mHz to 10$^3$ Hz.
