MORTIMER, Harvey Walklate (Grimwade p.602)

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12 April 1791 Harvey Walklate son of Harvey Walklate Mortimer of the parish of Saint Brides Fleet Street gunsmith apprenticed to his father farrier of London.

29 June 1799 Harvey Walklate Mortimer the younger of Fleet Street apprenticed to Mr Harvey Walklate Mortimer gunmaker of the same place admitted into the freedom of the City of London in the company of farriers by servitude.

I don't know which of these two Grimwade is referring to, but my guess is the younger one.

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27 July 1813 Harvey Walklate Mortimer Junior of the parish of Saint Bridget otherwise Bride batchelor and London gunmaker bound in marriage to Elizabeth Algar of the parish of Fersfield in the County of Norfolk spinster.

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11 May 1850 Harvey Walklate Mortimer Esquire of Algar House in the Parish of Forsfield in the County of Norfolk will proved at London.
Freehold estates in Fleet Street and Brides Passage in the City of London were left to daughter Julia Elizabeth Mortimer.

Source Citation: The National Archives; Kew, England; Prerogative Court of Canterbury and Related Probate Jurisdictions: Will Registers; Class: PROB 11; Piece: 2113 .
Held as TNA /PROB 11/2113/196
Will of Harvey Halklate Mortimer of Fersfield , Norfolk