OK just for the record this is desperate but the only Mason who is a Smith that I could find in 1861 in roughly the right area...
3 Orchard Row, Camberwell St Giles Surrey
Joseph Mason abt 1825 Warwickshire, England Head
Martha Mason abt 1822 Warwickshire, England Wife
Mary J Mason abt 1852 Warwickshire, England Daughter
William J Mason abt 1850 Warwickshire, England Son
Joseph is a Smith
RG9/381
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Page: 22
Jonathan