Help Trying to Identify this persons Hallmark K. Mtz

I have a beautiful silver cuff bracelet with a oxblood colored coral insert.It is marked inside " K. Mtz." Can anyone help me to identify its maker.
I have pictures posted here for your viewing.

<img src=/uploads/db3169/original/1X/634ae5fcfb2a63a21782b677036c8d7cb5890079.jpg">

<img src=/uploads/db3169/original/1X/c7d92798a3cb705f912a80acf34869e353da26ee.jpg">

You sure it’s not A. MTZ for Archie martinez?

When you click the link for the picture it is a bunch of gloves, if you can provide another picture please.