Watch tips with C hallmark?

I need help identifying this piece. As you can see it has a circle stamp that appears to have a C in the middle probably indicating a copyright? Below is stamped SN .925. As I have exhausted my research I have not been able to come across anything like it. I am sure it’s most likely a fake however I wanted to see if anyone could help me identify it. Thank you for your help!!!

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<img src=/uploads/db1846/original/1X/7f4d4684af0e8c456d9e7df44dfe0a98fca1c807.jpg">

<img src=/uploads/db1846/original/1X/82fd8980f690f431a1837f18e0d8a53aa6f15858.jpg">

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I did a quick google search, and a Native American Hallmark website attributes this mark to the Silver Nugget Company in Albuquerque, New Mexico. As I’m sure you already know, the stones in your watch tips are malachite, and the tips are probably 1970’s or 80’s. Hope this helps you in your search! :smile: