I found this ad for Speedball Sticks pens. I am fairly certain that I have seen these stick figures in one of my grandfather’s (Frank Wilkinson) notebooks. So I am think this is an ad he did the artwork for.
Speedball also seems to be very popular with artists, even today. So he may have just kept this because he liked the ad. The films in this ad are all from the early 1930’s, so this would have been very early in Frank’s career.