I'm fairly sure that that means it's the first edition, first run of the book. Well done.
Generally numbers (or letters) on a copyright page refer to an edition number so "12" would either mean a 12th edition or if they are 1,2 in sequence then a third edition.
A set of letters or numbers on the copyright page generally refers to the number of the printing or edition of the book.
The copyright usually is located at the back of the first page or the front cover of the book.
The copyright page of a book is typically on the reverse of the title page.
The edition number can be found on the page with the copyright information. This is usually one or two pages inside the book. It is almost always the first page with writing/information on it. The edition number should be printed underneath the copyright statement.
The part of a book that contains copyright and publishing information is typically found on the verso of the title page, also known as the copyright page. This page includes details such as the copyright notice, the name of the publisher, the publication date, and sometimes the ISBN number. It may also provide information about the book's edition and any relevant disclaimers.
The copyright page of a book is typically on the reverse of the title page, and includes copyright notifications and cataloging data for the national library of the country in which it was published.
The copyright page is generally on the reverse of the title page rather than on the back of the book. It includes copyright and printing information.
The reverse of the title page should have all of the copyright information.
You can determine the publication date of a book by looking at the copyright page, which is typically located on the back of the title page. The copyright page will usually include the publication date along with other important information about the book.
The copyright and catalog-in-publication data should be on the reverse of the title page.
all of above.