Hi Jonathan,

Thank you for contacting Mearto with your appraisal inquiry.
I don't find Don Keates among any listed painters if he is, in fact the painter of this work.
Based on the photos and information provided, and subject to examination, this is:

American School, 20th Century
Untitled winter landscape
oil or acrylic on board
inscribed "DON KEATES - 11TH" on the reverse
20 by 16 inches
CONDITION: appears to be in good condition
PROVENANCE: inherited
$250-350*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.