Here are the details of the map for the St Marylebone area:
This very detailed map covers the area from Montagu Square eastward to Harley Street and from part of Marylebone Road southward to Manchester Square. A major feature is St Marylebone Workhosue, shown in detail. Other features include Hertford House (now the Wallace Collection), Portman Chapel, Baker Street Bazaar, Marylebone High Street. On the reverse we have street directories for Devonshire Street, Gloucester Place, Great Marylebone Street, High Street, Manchester Square, Montagu Place and Square, Paddington Street.
The map links up with Sheets 7.41 Baker St to the north, Paddington Green to the west, and 7.52 Langham Place to the east.