  We present near-infrared polarimetric images of the dusty circumstellar
envelope (CSE) of IRAS 19306+1407, acquired at the United Kingdom Infrared
Telescope (UKIRT) using the UKIRT 1-5 um Imager Spectrometer (UIST) in
conjunction with the half-waveplate module IRPOL2. We present additional 450
and 850 um photometry obtained with the Sub-mm Common User Bolometer Array
(SCUBA) at the James Clerk Maxwell Telescope (JCMT), as well as archived Hubble
Space Telescope (HST) F606W- and F814W-filter images. The CSE structure in
polarized flux at J- and K-bands shows an elongation NNE-SSW with two bright
scattering shoulders NW-SE. These features are not perpendicular to each other
and could signify a recent `twist' in the outflow axis. We model the CSE using
an axisymmetric light scattering (ALS) code to investigate the polarization
produced by the CSE, and an axisymmetric radiation transport (DART) code to fit
the SED. A good fit was achieved with the ALS and DART models using silicate
grains, 0.1-0.4 um with a power-law size distribution of a^-3.5, and an
axisymmetric shell geometry with an equator-to-pole contrast of 7:1. The
spectral type of the central star is determined to be B1I supporting previous
suggestions that the object is an early PN. We have constrained the CSE and
interstellar extinction as 2.0 and 4.2 mag respectively, and have estimated a
distance of 2.7 kpc. At this distance the stellar luminosity is ~4500 L_sun and
the ~5300 yrs with a mass-loss rate of ~3.4x10^-5 M_sun yr^-1.
