I found this calendar on ebay.
In addition to the publisher's inscription, there is an inscription written on the backside,
barely visible amongst the textured lines, reading
Each inner panel contains a small picture (about 2¼" x 4¾") above 2 monthly calendars,
both within a background texture, all of which seems to be block printed.
In Japanese style, the weeks are displayed vertically.
Each panel is 7½" x 3¼".