Henry Nutting was apprenticed to Charles Wright and then worked for Thomas Chawner. He registered his first mark on 9th April 1796. On 17th June 1808 he registered a mark with Robert Hennell II and then alone again on 3rd October 1809.

It can be very difficult, if not impossible to detect the difference between makers marks belonging to Napthali Hart, Henry Nutting or Hannah Northcote.
I have attempted to disentagle them a little, as follows:

Anything dated 1796/1797 will be Henry Nutting
Anything dated 1798 to 1811 will be Hannah Northcote or Henry Nutting
Anything dated after 1812 could be any of the three

Hannah Northcote died in 1831 and Napthali Hart died in 1858

The first pair of tongs, dated 1796/96 will definitely be by Henry Nutting. The second pair, dated 1798/99 could also be by Hannah Northcote. The third pair could be by any of the three.

click here to see tongs by Napthali Hart

Click on any picture to enlarge