England, death certificate (certified copy) for Mary Nightingale died 11 December 1850; registered 14 December 1850. West Bromwich district,Oldbury Sub-district, County of Worcester; General Register Office, Southport.

Text from source:

CERTIFIED COPY OF AN ENTRY OF DEATH GIVEN AT THE GENERAL REGISTER OFFICE
Registration district West Bromwich
1850 Death in the sub-district of Oldbury in the County of Worcester
No. When and where died Name and Surname Sex Age Occupation Cause of death Signature, description and residence of informant When registered Signature of registrar
280 11 Dec 1850 Churchbridge Oldbury Mary Nightingale Female 63 Widow of Daniel Nightingale Boatloader |Humoral asthma 12 months Certified Richard Nightingale Present at the death Churchbridge 14 Dec 1850