The original drawings for the first ordnance survey maps , which in the case of Birmingham were around 1814-17 , have been available on the British Library site for some time. However they can now be viewed overlaid on present Google maps ,with variable opacity. Not very large scale, but interesting. The birmingham area and south of is at
https://britishlibrary.georeferencer.com/map/GEcIh88f0PMjkVQPzYGZxC/201311201403-x0PO5Y/visualize
and Aston & Sutton Coldfield is at
https://britishlibrary.georeferencer.com/map/MzN80DpMoSHTWAc1XHnSFm/201311201257-RcITmT/visualize
https://britishlibrary.georeferencer.com/map/GEcIh88f0PMjkVQPzYGZxC/201311201403-x0PO5Y/visualize
and Aston & Sutton Coldfield is at
https://britishlibrary.georeferencer.com/map/MzN80DpMoSHTWAc1XHnSFm/201311201257-RcITmT/visualize