« Reply #16 on: Sunday 10 November 13 23:24 GMT (UK) »
Just a couple of thoughts that might help.
If the vessel he was on was known to have gone down, he would likely have been considered to have drowned and be dead, and there would be no need to wait until the 7-year presumption of non-bigamy, I think. The 7 years really was just a defence against a bigamy charge: if it had been 7 years since someone disappeared, the remarried spouse could not be alleged to have committed bigamy. I'm sure there were many instances where men, especially, disappeared in clear circumstances indicating death and no one would have thought the woman was remarrying bigamously. (candychris, what is needed, though, is to know
why you have that in your tree.

)
There is a Benedict Quick birth registered in Penzance reg dist (covers St Ives) in June quarter 1860. Is that not the obvious birth? I just wonder since the original question says seekersue is looking for the birth. I guess having his age from the marriage certificate was the essential clue.
Heywood posted an 1871 census and there is an 1861 census to match, but he seems to have been entered as Bennet, father James a cordwainer.
HILL, HOARE, BOND, SIBLY, Cornwall (Devon); DENNIS, PAGE, WHITBREAD, Essex; BARNARD, CASTLE, PONTON, Wiltshire; SANKEY, HORNE, YOUNG, Kent; COWDELL, Bermondsey; COOPER, SMITH, FALLOWELL, WILLEY, Notts; CAMPION, CARTER, CRADDOCK, KENNY, Northants; LITTLER, CORNER, Leicestershire; RUSHLAND, Lincolnshire; MORRISON, Ireland; COLLINS, ?; ... MONCK?