Old Sterling & Fire Agate Watch Cuff Bracelet - Hallmark ID, please

Hello, I’ve searched for the maker of this old cuff watch bracelet, but I’ve not been successful. It’s not in “Hallmarks of the Southwest,” which is the only reference book I have for southwest jewelry. The hallmark is “LM” in script. If anyone is able to identify the maker, I’d greatly appreciate it. Thank you.

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Do you have any background on this piece, purchase date? where it was purchased?

Hi, Jason, Thank you for your response. No, I’m afraid I have no information on the history of the watch. I purchased it in a 2nd hand store locally. I’m pretty sure it’s Navajo made, and older, because it was made to accomodate watch faces, that have loops on the end, rather than the more current watch face, that has a spring bar. I’m still searching for the maker, though, so if the initials can be identified, that would be great.