Arthur G. Grimwade wrote a book in 1976 entitled
'London Goldsmiths 1697-1837 Their Marks & Lives', it was, and still is, the most comprehensive publication on London goldsmiths ever written for this period. The reproductions of the marks were taken directly from the ledgers at Goldsmiths Hall and considering it was written in pre-internet days the information that Grimwade gathered is simply amazing.
The numbers are those given by Arthur Grimwade to each mark.
It is a must-have book for those interested the subject. As you will no doubt have noticed, I'm a great fan of Grimwade.
There's some rare footage to be seen of the old master at:
viewtopic.php?f=38&t=17237Trev.