"Renown" is the trademark associated with W Hawcroft & Sons of Bath Works Sheffield circa 1892. The firm trademark was later associated with Needham Veall and Tyzack of Eye Witness Works from 1865 to 1925. Whether they bought out Hawcrofts after 1892 I don't know but is likely.
The usual way it was seen was " W Hawcroft & Sons, Sheffield, Renown" but variations I suspect were common.
The resource for Sheffield Trademarks for the cutlery Industry I used is here -
http://www.sha.org/documents/research/Parks_Canada_Resources/Trademarks on Base-Metal Tableware.pdf
As to whether the Renown Works for Russell Bros takes it's name from this old trademark - there may be some link to this.
Russell Bros were more machine knives than pocket knives from what I can tell from local information ( I live just out of Sheffield in the Peak District ).
Nice knife and great present