Nelson & His World

I have come across what is described as a Nelson seal for sale on EBAY. (Title of lot: " Antique 1855 Viscount Nelson Wax Seal Impression Skynner Solicitor London")

The red wax seal is impressed on the reverse of a calling/business card in the name of Mr Skynner 42 Mortimer Street Cavendish Square. In addition to the seal on the back, there is the following description written in ink " Impression from a Seal which belonged to the late illustrious Admiral Viscount NELSON of the Nile (now belonging to (see back) 1855 "

The seal itself is of a scallop shell with what appears to be a figure of Neptune standing in it, holding his trident.

I am aware that Nelson used a number of seals, one depicting his coat of arms, another called the "egyptian seal" depicting a palm tree, another described as the "Emma Seal" with the head of a woman. The NMM website also illustrates one with Nelson's name and a star on it, although it is not clear if that is a later commercial commemorative example.

Has anyone previously come across a "Neptune seal" attributed to Nelson?

Phil