Most visitors online was 1990 , on 7 Feb 2022
Hello David,A correspondent wrote to me asking about the hallmarks in the case of this watch with the movement marked RobtRoskell 35485. He has given me permission to post these images. The case is approximately 1.87 inches in diameter, or 47.5 mm.
I have just seen this message from January. One of my Joseph Johnsons, No. 3272, has gold marks identical to those of Roskell 35485 apart from belonging to the succeeding year of the cycle (date letter D). The sponsorial mark is the same (incuse E J), and this was assigned to Edward Jones in a correspondence on this board a few months ago. Unfortunately the leopard's face is not well struck in either impression, but it seems to be crownless; it was suggested to me that this would be appropriate for a date near the end of the 1821–22 run. My records suggest that the movement was already about three years old by then, since Allan Purcell's researches show that Johnson No. 3454 already existed in the United States in November 1819.A correspondent wrote to me asking about the hallmarks in the case of this watch with the movement marked RobtRoskell 35485 . . . The watch case has Chester Assay Office hallmarks for 18 carat gold. I was unsure about the date letter but, thanks to Allan's superb Robert Roskell Numbers File, it seems that No. 35485 was made in the early 1820s and that the date letter is therefore the "C" of Chester hallmarking year from 10 May 1820 to 8 November 1821 . . .
I have a 1909 Waltham 8 day car watch that had this treatment probably in WW2. It is however mounted in a gimballed bowl and a three section box. It is marked with the UK Broad arrow.The boxed pocket movement arrangement looks like some of the work done for the British Navy in World War I or II. They called for good chronometers, box and pocket and repackaged them a lot like this example