Which Elizabeth Clymo married William Crapp 10 June 1828 at St Blazey, Cornwall?
Reseach Note for the St Blazey Families Project by Wesley Johnston, begun 20 Sep 2014, last updated 20 Sep 2014
 
Overview of the Problem
On 10 June 1828, William Crapp, of St Austell, and Elizabeth Clymo, of St Blazey, married at St Blazey, Cornwall. Both signed their own names. And so did all three of the witnesses: Peter Clymo, Nanny Clymo, and Eliza Vivian. The image of the record can be seen at:
    https://familysearch.org/pal:/MM9.3.1/TH-1951-22657-56180-43
In the 1851 census, Elizabeth gave Camborne as her birthplace. The original of this record can be seen on Ancestry.com at:
    http://interactive.ancestry.com/8860/CONHO107_1907_1907-0213/7096329
or on Ancestry.co.uk at:
    http://interactive.ancestry.co.uk/8860/CONHO107_1907_1907-0213/7096329
Her age in 1851 was 44, thus placing her birth at about 1807.
The problem is that, according to the Cornwall Family History Society research database, there were two Camborne Elizabeth Clymo baptisms that both would have been 44 in 1851:
So which baptism was for the Elizabeth who later married William Crapp?
The Two Families
Peter and Elizabeth Clymo Family
The CFHS baptism DB identifies these children in the family of Peter and Elizabeth Clymo:
The CFHS marriage DB has only one Peter-Elizabeth marriage:
The parents Peter ("Mine Agent in Copper") and Elizabeth can be seen in the 1841 St Blazey census of "Biscovene" (Biscovey) with the two youngest children. The image of this record is on Ancestry.com at:
    http://interactive.ancestry.com/8861/MONHO107_2446_2447-0303/15370765
So this family is documented at St Blazey in 1819 and 1841. And the fact that the mother was Elizabeth Vivian also resonates with the witnesses to the 1828 marriage including an Eliza Vivian.
James and Anne Clymo Family
The CFHS marriage DB lists only two James-Anne marriages:
So there are two families to keep straight, one in western Cornwall and one in north central Cornwall. The CFHS baptism DB lists James-Ann/Anne children in this period from Camborne (1805-1815), Cubert (1810-1814), St Austell (1817) and St Columb Minor (1808-1821). Clearly the Camborne children and St Columb Minor children belong to the 1804 and 1805 couples, respectively.
The Cubert baptisms both appear to be of a Perranzabuloe couple, once the original images are seen. The 1814 record shows the father James as a Hubandman of the Parish of "Peran Zabuloe".
The father in the 1817 St Austell baptism is James, a Miner from Holms Bush. The 1815 Camborne image is not online, but Cornwall OPC shows the father James as a Miner. But the 1815 baptism at St Columb Minor shows that father James as a farmer. So it appears that the 1817 child was of the Camborne couple.
So it appears that these are the baptisms of the James Clymo and Ann Budge who married 2 Apr 1804 at Camborne (known only through the transcriptions of the Devon and Cornwall Record Society):
I have not been able to find this family in the 1841 census. But the fact that they were at St Austell in 1817 does put them in the immediate vicinity of St Blazey, so that their Eliza cannot be ruled out as the one who married William Crapp.
Weighing the Evidence
The 1806 Elizabeth, daughter of Peter and Elizabeth (Vivian) Clymo, definitely has the most evidence for being the one who married William Crapp at St Blazey in 1828.
The only evidence favoring the 1807 Elizabeth is that her family were in St Austell in 1817. The only witness who corresponds to a family member is the 1815 Anne (as Nanny), but she was only 13 at the time of the marriage and thus not as likely to be the correct Anne, while the Anne of the Peter-Elizabeth family was then 25 and of the right age to be a witness.
Conclusion: The 1806 Elizabeth (daughter of Peter and Elizabeth) married William Crapp
The evidence weighs heavily in favor of Peter and Elizabeth (Vivian) Clymo's daughter Elizabeth Clymo, baptized at Camborne 10 Jun 1806 being the one who married William Crapp in St Blazey 10 Jun 1828 -- the same day as her baptism 22 years earlier.
And this is how I am carrying her in the database. If other documentation refutes this, I will gladly change the database. But in the absence of such evidence, the existing evidence is too strong to carry her any other way.