This simple little diary book was likely a promotional giveaway item at the time, keeping you coming back every month to get your next month's book
Dated June 1939 and has most pages blank with a couple having kid's pencil writing and one page with a highliter mark as pictured. Other pages are all blank. Starts on the third day of the month with a couple of the first pages having been removed at some point in time. Reuseable next in 2034