Silverplate Coffee pot Maker and Date?

Here is a silverplate coffee pot. From the marks, I believe it was made by Martin Hall and Co., Sheffield. Does anyone have any thoughts about the other marks: the heart, I W etc.? Also, would the pot be late 19th century?

Here is the picture of a mark that looks similar to the one on the pot:
silvercollection.it/MARTINHALL11BIS.jpg