Hi all,
Mike, my copy of Grimwade says Thomas Eustace of Exeter entered his mark on 20th April 1779, not 1778. This means the date letter C was being used for 39 days after he entered his mark.
However, I'm very reluctant to attribute London silver with TE to Thomas Eustace. In my researches into Exeter silver I haven't yet found any proveable reason why he should have taken his silver to London at this time, when his house was around 300m from the Exeter assay office. It may be that he had a supplier of (for example) buckles in London, and had the supplier mark the buckles with his TE mark before sending them to the London assay office and then on to him in Exeter. That's one theory.
Another theory: going by memory, I recall a letter written to the assay master at Exeter by, I think, one of the Williams family of Bristol. It was a complaint that a batch of their silver had been found worse than 92.5 and destroyed at the Exeter assay office. They took the liberty of sending the returned silver remains to London where it was found better than 92.5. To do this, they may have had to register a mark at London first. Thomas Eustace may have had a similar reason.
I may just be overly cautious because of my research, but I would plump for Thomas Evans. Grimwade does say his mark had no pellet until 1779, but I don't put much faith in pellets!
Miles
His mark with an Exeter Lion passant on a pair of c.1780 pre-duty tongs.
