  Among the large varieties of active galactic nuclei (AGN) known, narrow line
Seyfert 1 (NLSy1) galaxies are a puzzling class, particularly after the
discovery of $\gamma$-ray emission in a handful of them using observations from
the Fermi Gamma-ray Space Telescope. Here, we report the discovery of a rare
large double lobed radio source with its radio core associated with a NLSy1
galaxy SDSS J103024.95+551622.7 at z = 0.435. The lobe separation is 116 kpc
which is the second largest known projected size among NLSy1 radio sources.
This finding is based on the analysis of 1.4 GHz data from the Faint Images of
the Radio Sky at Twenty-centimeters (FIRST) archives. Along with the core and
edge-brightened lobes we detected significant (30%) fraction of clear diffuse
emission showing typical back-flow from FR II radio galaxy lobes. For the
source, we estimated a jet power of $3 \times 10^{44}$ erg s$^{-1}$ suggesting
that its jet power is similar to that of classical radio galaxies. Emission
from the source is also found to be non-variable both in the optical and
mid-infrared bands. Identification of more such sources may help to reveal new
modes of AGN and understand their role in black hole galaxy evolution.
