Hello
Below is a scetch of your mark with Wm. Rogers Mfg. Co. under it.
William Rogers Mfg. Co.was incorporated in 1872.
Became a division of the International Silver Company in 1898.
Around 1905 International Silver opened a Canadian branch of the Wm. Rogers Mfg. Co. division.
The scan below comes from a Canadian silver reference book. That's the only place I have seen your mark.
I suspect the mark was used on pieces produced at the Canadian plant, but can't confirm this.

Pat.