Another Earliest Citation for "Real McCoy"

[Shapiro, Fred]

The previous earliest known citation for "real McCoy" (in its various spellings) is the 1856 first use in the OED.  Here is what is apparently another 1856 citation:

1856 _Manchester Guardian_ 13 June (ProQuest Historical Newspapers)  The _Dundee Advertiser_ relates the case of a beggar, named M'Kay, who, though buried at the expense of the parish, left deposit receipts int he amount of [700 pounds]. ... Margaret, who had so warmly wept over her father's grave, was obliged at last to yield the day in favour of William, the "real M'Kay," who has now been decerned sole executor to his father by the sheriff.

Fred Shapiro
Editor
YALE BOOK OF QUOTATIONS (Yale University Press)

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