Snowflake, I found that reference Trademarks on Base Metals several years ago and it has been extremely helpful!!!! I find myself referring to it quite often!!!
Glad my suggestion helped out! Now you can zero in on it a little more!!!
"Henry Hall joined the partnership in 1848 and the company was known as Walker & Hall in 1853.
The famous trademark of the flag was first registered in 1861. In 1892 Walker & Hall bought the manufacturing silversmiths, Henry Wilkinson & Company.
The firm was managed by Sir John Bingham, Hall's nephew, until 1916. He was succeeded by Sir Albert Bingham.
In 1963 Walker & Hall combined with Mappin & Webb and Elkington to form British Silverware Ltd., which closed down in 1971 due to industrial action. Walker & Hall was later revived as a retail firm."