  An optical spectrum of the star V1648 Aql (=IRAS 19386+0155) was obtained at
the 6-meter telescope with a spectral resolution of R$\ge$60\,000. Heliocentric
radial velocity measured from numerous metallic absorptions is equal to
V$_r$=$10.18\pm0.05$ km s$^{-1}$ (V$_{\rm LSR}$=18.1 km s$^{-1}$). We
determined the atmospheric, circumstellar, and interstellar components in the
profile of the NaI D~lines at V$_r$=9.2, $-3.4$, and $-12.8$ km s$^{-1}$
respectively. The averaged over twenty identified DIBs velocity
V$_r$(DIBs)=$-12.5\pm0.2$ km~s$^{-1}$ coincides with the interstellar NaI
component. Weak emissions with an intensity of about 10% of the local continuum
level were detected in the spectrum; they are identified as low-excitation
metal lines. Their averaged position, V$_r$=$8.44\pm0.28$ km s$^{-1}$, may
point to the presence of a weak velocity gradient in the upper layers of the
stellar atmosphere. Based on the spectroscopic data and taking into account the
interstellar and circumstellar reddening, we estimated the star's luminosity
M$_V\approx-5^{\rm m}$ and also obtained the lower estimate of distance
d$\ge1.8$ kpc. Using the model atmosphere method, we determined the fundamental
parameters and chemical abundances in the atmosphere approving the status of a
post-AGB star for V1648 Aql.
