HELP!!!!!! Can anyone identify these hallmarks???? please!!!

Hi my name is Chris and i have only just joined this site. I have recently been given a silver tea pot, and my wife believes it to have meaning to a great grandad. Can anyone tell me what the hallmarks represent, and/or it has a monetary value??? Any information would be greatfully recieved.
silver tea pot(1).JPG
silver tea pot hallmark(1).JPG

Atkin Brothers, Sheffield, England.

pewtertankardsflagons.com/in … te-marks-A