Hair Comb Unknown Maker Year Etc

[Limberlostgirl]

I need help, I inherited a hair comb and would like to gather some more information about it. All we know is it was bought at an estate sale about 30 years ago. It has 4 6 on the back and STERLING.
Image of Comb:


Image of the Mark:


Any help would be greatly appreciated.

[Limberlostgirl]

So sorry pictures posted incorrectly:

Front of Comb:


Back Markings: