  A comparison of the recent LOFAR 144 MHz map of the radio source 3C 223.1
(J094124.028+394441.95) with the VLA maps at 4.9 GHz and 8.3 GHz that we built
based on archival data, establishes this X-shaped radio galaxy (XRG) as a
singularly robust case where the 'wings' exhibit a distinctly flatter radio
spectrum than the primary lobes. The details of its anomalous spectral gradient
are unravelled here with unprecedented precision. We also highlight the 'double
boomerang' type radio morphology of this XRG. It appears plausible that the
peculiar spectral gradient in this XRG is owed to particle acceleration
associated with the rebounding of the collimated backflows of synchrotron
plasma streaming through its two primary lobes, as they impinge upon and
encounter the magnetic tension in the prominent dusty disk of the elliptical
galaxy hosting this XRG. We also draw attention to an intriguing new
morphological peculiarity among XRGs, namely, a lateral offset observed between
the (parallel) axes of the two primary radio lobes.
