Meaning of the letters HS on ciborium made by Meriden Britannia Company

[EmilieDeschenes]

Hi,
I am an art historian working on an inventory of heritage objects in a catholic church near Quebec City, Canada. I’m trying to identify a silvermark fond on a ciborium donated in 1913. The phoenix seems to indicate it was made by Meriden Britannia Company. I’m trying to find out what the letters HS stand for.

Thanks!