The General Register Office (GRO) has the birth registration of -
James Griffiths, September Quarter 1838, district The Clun Union, volume 18 page 52 - mother's maiden name NOT present.
You are quoting details from the index to this birth registration. This is not the parish record.
Sight of the certificate itself is only available through purchase - either via the GRO or the local registry office holding that record.
There's a baptism on 27 Sep 1835, Clun, of a James Griffiths, parents, William and Elizabeth, father labourer, abode Upper ?