Carved Jade Pin at estate sale

[campfire]

I found this pin at a sale. It has bits of purple and green. It is about 2.25 x 1.5 inches. The back has four different marks. Two of the marks are partly obscured by the clasp. I was told it was brought to the US from china around 1940. Thanks for any help.

 

[bradyboy]

mother of pearl?

 

[Molewacker]

Nice piece! Hoping someone that knows the hallmarks stop by -

With the back of the jade carved as well as the front, indicates to me a quality piece