Hard to see how the NGS could have placed this bench mark in Arlingwood, as stated in the 1990 description. The county name, of course, is Arlington. The station is located at the west (Virginia) end of Chain Bridge, just south of the end of the bridge. (Traveling between Virginia and DC would seem to be a north-south proposition, but actually the bridge orientation is closer to east-west.) The station is about 2 feet from Vepco pole EJ62, which has a streetlight at its top.
The stamping, which is also the designation, apparently refers to the elevation in feet, although the adjusted height of this first order vertical station is slightly different - 51.27 feet.
One mystery about the disk: the surface is covered with about 45 depressions small, round, irregularly-spaced depressions of unknown origin.
[Photos:]Closeup of HV8783, Arlington, VA
View toward Chain Bridge, Arlington, VA
52 34 is indicated by yellow arrow
The triangulation station was found as described.
The disk is rather unusual. It is very thick, when viewed from the side. Also, the monumentation date is unknown to the NGS. I would guess it was from the 1930's, when the bridge was built. The marking on it, and its NGS designation, is 52 34, which I belive to be a stamped elevation of 52.34 feet. The elevation on the PID sheet is 51.27 feet, but the difference is probably due to geoid modeling differences.
[Photos:]Station 52 34 in Arlington County, Virginia
The disk. The elevation stamped on it is 52.34 feet.
at station 52 34 in Arlington County, Virginia
The disk has a red arrow pointing to it. In the lower right of the picture is the Potomac River. The view on the left past the bridge railing is Maryland.
The historical marker explains the history of Chain Bridge. The current structure was built around 1936, according to the sign.
at station 52 34 in Arlington, Virginia
A red arrow points out the disk's location. A yellow arrow shows where a surveyor spray painted the station's designation on the metal girder
On the right side of the picture is the Virginia shore of the Potomac River and a stone structure that may be part of a former version of Chain Bridge.