This high quality puzzle reproduce a city map of Oporto drawn in 1833 by the architect W. B. Clarke for the Society for the Diffusion of Useful Knowledge (UK) and published on an atlas by Baldwin & Cradock.
The SDUK was founded in 1826 by Lord Henry Brougham, a british statesman that believed in the promotion of self-education and the disclosure of the knowledge for the working classes as for the bourgeoisie that could not make use of experienced teachers.
The SDUK publications were dealing with useful subjects as history, geography, zoology in an easy way to support those who had just learned to read to improve their reading skills and knowledge.
Among several publications, the SDUK published some extraordinarily detailed atlas. At the time there was nothing like that anywhere in the world for its quality and price.