Pint Tankard Marking Conundrum

Hi there,

I have been having fun trying to understand the hallmarks on a pair of silver tankards that I recently acquired.

To be honest I have got quite stuck, other than them being Electro Plate I have about 5 differing options where and when they could be from … ranging from Glasgow 1850s to Sheffield 1910

Any help on understanding the code would be much appreciated

Thanks

Dave