  The hard X-ray transient source Swift J1845.7-0037 was discovered in 2012 by
Swift/BAT. However, at that time no dedicated observations of the source were
performed. On Oct 2019 the source became active again, and X-ray pulsations
with a period of ~199s were detected with Swift/XRT. This triggered follow-up
observations with NuSTAR. Here we report on the timing and spectral analysis of
the source properties using NuSTAR and Swift/XRT. The main goal was to confirm
pulsations and search for possible cyclotron lines in the broadband spectrum of
the source to probe its magnetic field. Despite highly significant pulsations
with period of 207.379(2) were detected, no evidence for a cyclotron line was
found in the spectrum of the source. We therefore discuss the strength of the
magnetic field based on the source flux and the detection of the transition to
the "cold-disc" accretion regime during the 2012 outburst. Our conclusion is
that, most likely, the source is a highly magnetized neutron star with B 1e13G
at a large distance of d~10 kpc. The latter one consistent with the
non-detection of a cyclotron line in the NuSTAR energy band.
