If authentic, it is one of the rarest and most valuable variations of the 392E. The recently published Greenberg's Guide shows it on page 268. The photo shows a 392E with black bands and domes and a copper handrail.
Joe - The gunmetal grey version of the 392E had nickel trim. MTH has made the black 392E with nickel trim, but it appears that Lionel did not, as no such variation is shown in Greenberg.