Good morning everyone, Today I visited a old collector and a friend. He has this 1924 20 dollar coin that I puzzled by. The mint mark is inverted with parts raised. What I can read out of it is CSA stamped on each other. I have not a clue what this is. Any info would be greatfully appricated. The pictures are taken by my iphone and I used is microscope for the close ups. So forgive the fuzzyness
I believe that is the designers initials. Augustus St. Gaudens. The mintmark, if any would be above the date.