In 1887, John Bartholomew's Gazetteer of the British Isles described Overseal like this:
Overseal, vil. (ry. Sta. Overseal and Moira), Seal par., Leicestershire, 5 miles SW. of Ashby de la Zouch; P.O., T.O. See SEAL, NETHER AND OVER.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Overseal has changed, please see our redistricted information for the modern district of South Derbyshire. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Overseal and units named after it.
GB Historical GIS / University of Portsmouth, History of Overseal in South Derbyshire | Map and description, A Vision of Britain through Time.
Date accessed: 12th December 2013
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Overseal".