This is an Azo Postcard from 1904 to 1918.
Sisters? Student and teacher?
I purchased this postcard in an antique shop in Duluth Minnesota.
Thanks for stopping by. Do come again:
Update from Iggy:
Helia Marie Erickson (24 Nov 1901 - 15 Apr 2006 at the age of 104!!)
Esther Rose (22 Nov 1908 - 5 Feb 1991) of the same town (Duluth, Saint Louis, MN) married an Erickson - so they were likely sister-in-laws.
Esther Rose married Emmanuel Erickson (03 December 1900 - 02 May 1967)