Antique Hallmarked retailer Double Heart Mizpah Brooch Sterling

Gorgeous antique silver hallmarked Mizpah brooch featuring a double heart retailer design. One side of the heart has some crude etching on the back that I cannot make out, but it is not at all seen when worn and does not affect the structure of the piece (just adds history!) Features rose and yellow gold-coloured leaf details across the hearts in a banner style. Tube hinge and C clasp; however, is missing the "C" so needs a small repair.

Reads: "The Lord watch between me and thee when we are absent one from another".

Hallmark is somewhat difficult to decipher, but the last character is an O. Early 1900s.

Opposite side has the maker's mark, and can only make out the letters BRO. However, it represents S. BROS (Sydenham Brothers).