Marks from my Grandmother's Shoe Horn

Amongst my aunt’s possessions was a shoe horn with the following marks.
Can someone interpret them please.
(If my reading is right (and I am probably wrong) it was assayed at Chester in 1727)
Tui Shoe horn.jpg

One mistake - and it’s a trap lots of people fall into. You have correctly identified the assay office as Chester, but you have missed the fact that this lettering style was used twice and, rather than 1727, this is 1902. The difference is in the form of the town mark and lion passant and the fact that in 1727 there would also have been a crowned leopard’s head. The maker is Colen Hewer Cheshire of Northampton Street, Birmingham.