I wonder if James is from Trevethin / Pontypool area ?
Seth is not a common christian name in the area

1851
James Morgan abt 1807 Newton, Glamorgan, Wales Head Trevethin, Monmouthshire
Elizabeth Morgan abt 1816 Birmingham, Monmouthshire, Wales Wife Trevethin, Monmouthshire
Sarah Morgan abt 1834 Cinderford, Glamorgan, Wales Son Trevethin, Monmouthshire
Enock Morgan abt 1837 Cinderford, Glamorgan, Wales Son Trevethin, Monmouthshire
Annamaria Morgan abt 1844 Cinderford, Glamorgan, Wales Daughter Trevethin, Monmouthshire
Henry Morgan abt 1848 Trevethin, Monmouthshire, Wales Son Trevethin, Monmouthshire

William Morgan abt 1830 Coleford, Gloucestershire, England Nephew Trevethin, Monmouthshire

1861 Ruspidge
James Morgan abt 1811 Newhond, Gloucestershire, England Head East Dean, Gloucestershire
Elizabeth Morgan abt 1796 Birmingham Wife East Dean, Gloucestershire
Anamasia Morganabt 1844 East Dean, Gloucestershire, England Daughter East Dean, Gloucestershire
Hary Morgan abt 1850 Pontypool, Monmouthshire, Wales Son East Dean, Gloucestershire
Hephribath Morgan abt 1852 Pontypool, Monmouthshire, Wales Daughter East Dean, Gloucestershire
Mary A Morgan abt 1855 East Dean, Gloucestershire, England Daughter East Dean, Gloucestershire

1871
James Morgan abt 1811 East Dean, Gloucestershire, England Head East Dean, Gloucestershire
Elizabeth Morgan abt 1816 Birmingham Wife East Dean, Gloucestershire
Mary Ann Morgan abt 1855 East Dean, Gloucestershire, England Daughter East Dean, Gloucestershire
Aaron Morgan abt 1869 East Dean, Gloucestershire, England Grandson East Dean, Gloucestershire

Name: James Smith
Name: Mary Ann Morgan
Year of Registration: 1872
Quarter of Registration: Jul-Aug-Sep
District: Westbury On Severn
County: Gloucestershire
Volume: 6a
Page: 437

1881
James Smith abt 1853 Monmouth[SHIRE], Wales Head Westbury On Severn - East Dean, Gloucestershire
Mary Smith abt 1855 East Dean, Gloucestershire, England Wife Westbury On Severn - East Dean, Gloucestershire
Henry Smith abt 1874 East Dean, Gloucestershire, England Son Westbury On Severn - East Dean, Gloucestershire
John Smith abt 1878 Durham, England Son Westbury On Severn - East Dean, Gloucestershire
Alfred Smith abt 1880 Yorkshire, England Son Westbury On Severn - East Dean, Gloucestershire

1891
James Smith abt 1852 Monmouthshire, Wales Head East Dean, Gloucestershire
Mary A Smith abt 1855 East Dean, Gloucestershire, England Wife East Dean, Gloucestershire
Henry Smith abt 1874 East Dean, Gloucestershire, England Son East Dean, Gloucestershire
John Smith abt 1878 Spennymoor, Durham, England Son East Dean, Gloucestershire
Alfred Smith abt 1880 Featherstone, Yorkshire, England Son East Dean, Gloucestershire
William Smith abt 1883 East Dean, Gloucestershire, England Son East Dean, Gloucestershire
Emily Smith abt 1885 East Dean, Gloucestershire, England Daughter East Dean, Gloucestershire
Martina Smith J abt 1887 East Dean, Gloucestershire, England Daughter East Dean, Gloucestershire
James Smith abt 1889 East Dean, Gloucestershire, England Son East Dean, Gloucestershire

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Ἀριστοτέλης A Gloster & Hereford Boy in the Forest of Dean ><((((*>

I have no information about Mr Smith but I have a MARY ANN MORGAN in my Family History who is a candidate for your ancestor. My gg aunt ELIZABETH MORGAN had issue MARY ANN MORGAN, father unknown, in Monmouth Union Workhouse on the 13th January 1850. ELIZABETH MORGAN later married WILLIAM CRADOCK on 25th November 1855 in Parkend Chapel: they had nine children.

MARY ANN MORGAN was residing in Pillowell, West Dean, Forest of Dean, Gloucestershire, with her aunt and uncle HENRY and HANNAH MORGAN (my direct ancestors) at the time of the 1861 census. MARY ANN was 11 years of age, a scholar and born in Monmouth.

I have no further information about MARY ANN MORGAN but would be delighted to discover what became of her.

Chris Morgan