EPNS W&R mark vase (Wilkinson & Roberts) so may be 1840s?

Puzzled as to whether my research is on the mark ....

This lovely old vase bears the mark “EPNS W&R. According to silvermakersmarks.co.uk this mark is “possibly Wilkinson & Roberts who registered a similar incuse mark Nov 1831” (established in 1820 in Sheffield, England by Henry Wilkinson and John Roberts).
In 1846 Roberts went into partnership with his former apprentice, Ebeneezer Hall, and became Roberts & Hall. In 1854 Richard Martin and Joshua Hall (Ebeneezer’s brother) joined the partnership and became the prominent firm Martin, Hall & Co. (So presumably this vase, marked W&R, dates to before 1846.)
Any collectors' advice would be appreciated.