I am seeking information on an engagement ring from about the 1920's in the United States of America The ring is a silver color(white gold?) with a setting of an aproximately 1.25 carrat diamond with with a small diamond on both sides of the large center stone. The ring band is stamped with the letters "THPALL" or pehaps "TH PALL" on the inside. There are no other markings I can see under magnification.
Any information regarding this ring and more particularly the meaning of the mark would be appreciated. Thank you.