Does the ES stamp on this pendant stand for Ehrlich & Sinnock?

by Brenda
(Tacoma WA)

The attached pictures are of a pendant that belonged to my grandmother. The back is stamped with 14k and ES. I'm curious as to what the ES stands for. Hours of searching have brought me to the Guru for help. I'm not looking for a value, just some insight into the jewelry maker's history. The curiosity is killing me...Help...