It’s brown print and mounted on brown board and is 1ft8″x2ft4″ – it was “Reproduced by the Ordnance Survey Dept, Phoenix Park, Dublin, to mark the Bi-Centenary of the Royal Dublin Society, 25th June 1931”
The 1756 map goes from Glassnevin/North Strand at the North to Harolds Cross/Rathfarnham Road on the South.
The Tallaght map (linked above) is dated at 1760, while the Rocques map of Dublin City and Environs is from 1756 (which you all probably know).
Perhaps he did such a good job of the City that he was commissioned to do the ‘here be dragons’ outskirts of Tallaght.