They're quite possibly made by marples, they acquired the brand
I.
smith
SORBY, I.
name
SORBY, I.
city
Sheffield
comment
SORBY, I. SHEFFIELD
The originator of the I. SORBY mark was Isaac Sorby who traded under his own name until circa 1814, then as Sorby, Turner & Skidmore until 1821 and as...