Vintage 1921 calendar "Rock-A-Bye Horsey"

Description

ONE HUNDRED YEARS ago this was probably on someones kitchen wall or perhaps not as the months are not ripped off. Regardless kind of a nice old piece of ephemera that I acquired somehow somewhere. I have had it like forever and really belongs in the hands of a collector. I'm just a pack rat and trying to clean house.
You can see from the photos that the back page has tears and I have resisted glueing or taping the calendar onto the page. The piece measures about 7.5 inches by roughly 12 inches. There is no advertising on this calendar. The lower left of the picture does have that small letter "c" inside a circle; copyright? The initials are GB and perhaps stand for Great Britain. I'm only speculating of course.
Thank you for your consideration. I do have two other calendars that I will be listing very soon so please check back if this is your thing. "Your thing" being calendars without pinup girls. Perhaps we can call the two young ladies pictured as pinup girls. :-)
I'll wrap this up in paper for extra protection before placing in a 10 x 13 Kraft envelope.