This is a striking wide bowl by Maximiliana “Anna” Martinez, who was a sister of Maria Martinez.  It is one of her few black-on-red pieces.  The jar has a sun design (the center checkerboard) with a rainbow pattern above and an overall tablita appearance.  The shape is a classic one for Anna with a wide sharp shoulder.  The red is a very deep coloration on this bowl and the painting creative in style   It is unsigned but easy to attribute to Anna.   It is in very good condition with no chips, cracks, restoration or repair.

https://kinggalleries.com/san-ildefonso-pottery-innovators/