Silver Spoon help

Hi chaps, i have some spoons with these markings on and i cant decipher any of the markings. I would appreciate if you could point me in the right direction. Images below

i.imgur.com/KAv3p.jpg
i.imgur.com/vyqyd.jpg
i.imgur.com/nLA9T.jpg

This is a London hallmark for sterling silver, date letter “d” is 1819 and IH is either John Harris or John Hawkins, who both registered similar marks.