Which potrait company could this stamp possibly belong to?

I found a picture of what could possibly be my great grandmother or my great great grandmother however it is damaged. However, I found a partial elipictal stamp impression which states "St. Louis Stu (Im guessing the stu was cut off and meant studio) on the top. In the middle, it has 1258 S. Broad but the "D" was cut off so theres more to the address. On the bottom it has St. L with the L cut off. This company probably doesnt exist anymore but I still want to find out.