This is not just a calendar, for the back is a useful compendium of Postal rates, from letter to parcel post, stationery, and postal orders. And it may have been issued at this early date, but it did not make the Wills reference books until part III, where it is listed with its pair, as :
55. 2 CALENDARS. Unnumbered. Fronts printed from relief blocks in colour; backs in blue, headed “Post Office Information”. Home issues : -
A. Calendar for 1911, issued 1910
B. Calendar for 1912, issued 1911
And you can see the Calendar for 1912 as our Card of the Day for the 4th of February, 2024.
There is no month of issue recorded for either of these but it seems safe to imagine they were in the final parts of the year before. However I have to wonder why this useful item was only issued in these two years? Any ideas?
This information is only slightly altered in our original World Tobacco Issues Indexes, to
CALENDARS (A). Sm. Backs inscribed “Post Office Information” ... W62-72
1. “Calendar for 1911” (1)
2. “Calendar - 1912” (1)
And this remains the same in our updated version of that work, apart from a new card code, of W675-105