Apparently this is a coalhole Coal holes: These are covers from the period when the houses were heated with coal, into which the coal bags were poured, so that the coals did not have to enter the houses. These lids were used in the 19th and early 20th centuries.
The lid is similar to other lids of the same manufacturer, and differs mainly in the number of circles in the outer ring Click for cover's details
In 2022, a similar cover was taken at 6 Glentworth St, London NW1 5PG, UK, with the ventilation nozzles covered Click for a larger image