Honeycombs break out
The wheels of hexagons, the honeycomb pattern, moved beyond the borders of Brooklyn in the 20th century, and became synonomous with Sewers. This one has only a vestigial, and superfluous S.
DESIGN:
In New York at least, the design became standardized. Nineteen solid hexagons in three circular rings, with single letters imprinted in individual hexagons.
UTILITY:
This was probably cast by the consolidated Department of Public Works before the Borough Presidents started branding their borough's covers.
RANGE:
This cover is on Broadway about 119th St. in Manhattan, but because the S hexagon is easily worn down, many seeming blank covers throughout the city may be of this type.