In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Sealand like this:
SEALAND, a township in Hawarden parish, Flint; 2 miles N W of H. village. Acres, 5, 514; of which 535 are water. Real property, £6,052. Pop. in 1851, 291; in 1861, 390. Houses, 66. The increase of pop. arose from reclamation of marsh land. A church was built here in 1866, and is in the early English style.
This is the only descriptive gazetter entry we have found, but you may be able to find further references to Sealand by doing a full-text search here.
Sorry, but no mentions of this place can be found.
This website includes two large libraries, of historical travel writing and of entries from nineteenth century gazetteers describing places. We have text from these sources available for these places near your location:
|Place||Mentioned in Travel Writing||Mentioned in Hist. Gazetteer|