Monkey Business

I recently acquired a travel poster produced by Scandinavian Airlines System (SAS) promoting services to India which was part of a larger series of similarly themed posters they issued around the same time. These posters are not dated, and the image on the lower right is of the only information printed on the poster.

The SAS monkey looked very familiar, and I found this February 1959 Air-India International Time Table with a strikingly similar image. Here we have a trio of monkeys in the famous 'see no evil, hear no Evil, speak no evil' pose.

Now, Air-India has used many exotic birds, large cats and elephants in their Time Table art,  but never monkeys. So, is it just a co-incidence, or did one airline copy the other.

Would love to hear from other collectors, especially if someone can date the SAS poster for me.