Old coins identified by numerical data (including old sovereign) (7)
I believe the answer is:
staters
'old coins identified' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'numerical data including old sovereign' is the wordplay.
'numerical data' becomes 'stats' (statistics).
'including' means one lot of letters goes inside another.
'old sovereign' becomes 'ER' (Elizabeth Regina, ie Queen Elizabeth).
'stats' enclosing 'er' is 'STATERS'.
'by' is the link.
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