In an earlier post, I indicated that I knew of only one edition of Professor Hoffmann’s Auction Bridge. It turns out that there are at least two editions dated 1912 on the title page. The presumably earlier one mentions both London & Birmingham on the title page, while the later one mentions London, but not Birmingham.
The same change is reflected in at least four other places in the later booklet as well, namely at the bottom of page 70, and on the two pages of advertisements following page 70, and on the inside back-cover. Also, the list of booklets on the inside front-cover is slightly different.