This is a high action calendar art print of a cowboy and horse “suprised” by a grizzly bear and her cubs. Bears were a popular subject in many c1940s calendar prints. A Wood Picture Puzzle was also made from this image.

Sizes I have found:
8 1/2" x 12"
16" x 20"

Printed on the back:
The Constellation Line
Title: Surprise by Olaf Wieghorst
This picture is included in the following series of calendars.
Commodore Series No. 4635
Please replace this picture in Envelope “D”

From a 1946 painting titled: “Surprise”
Oil on canvas, 30 x 40 inches