WON’T UPLOAD SO I EMAILED THE PHOTO. HALLMARK IS A CT WITH THE T AT THE BOTTOM RIGHT OF THE C AND A SLASH AT THE TOP RIGHT OF THE C
I don’t find anything right away, can you show me the style, Navajo, Hopi or Zuni? I do see a Griffin Tsabetsaye that looks similar, do a google search and see if the style looks like your piece.