How to Read a Number Line
The short answer. Find the row of digits near the foot of the
copyright page. The lowest digit present is the
printing. If a 1 is there, you are holding a first printing. If the lowest
digit is a 4, you have the fourth printing — whatever the rest of the page says.
Why the line exists
A number line — a printer's key, properly — is a production tool that collectors happen to find useful. The digits were set so that at each new impression the printer could remove the lowest one rather than reset the page: on an offset plate the character is simply erased, and in letterpress the relevant block is picked out of the forme. Subtraction was cheaper than addition, which is why the line counts downward as the book succeeds.
That also explains its limits. It records what the printer did, and nothing else — not the edition, not the state, not the year your copy was bound, and not whether the copy is a trade printing at all, since book clubs reprinted the line verbatim along with the rest of the page.
The orderings, and why they differ
Publishers run the digits in whichever order they like. Three are common:
| Form | Example | Reading |
|---|---|---|
| Descending | 10 9 8 7 6 5 4 3 2 1 | The commonest form. A 1 at the right-hand end is a first printing. |
| Ascending | 1 2 3 4 5 6 7 8 9 10 | Same rule from the other end. |
| Split | 1 3 5 7 9 10 8 6 4 2 | Odds out, evens back. Used so the line stays roughly centred on the page as digits fall away. Simon & Schuster adopted it around 1981; Pantheon and others use it too. |
None of this changes the rule. Read for the lowest digit present and ignore the arrangement entirely.
Lines that carry a year
Some houses interleave a second run of digits for the year:
2 3 4 5 6 73 72 71 70
Read the two halves separately. The lowest number in the printing half is the
printing; the lowest number in the year half is the year that printing was
run. The line above is a second printing made in 1970. Harper used this form
from about 1975 — a line such as 80 81 82 83 10 9 8 7 6 5 4 3 2 1 is a first
printing with four years of headroom built in.
The exception that costs people money
1. A first
printing therefore shows the words and a line whose lowest digit is
2. At the second printing the words were dropped and the line left
alone — so the identical run of digits, minus three words, means a second
printing. From about 2003 Random House moved to the industry standard and a
first printing carries a 1 like everyone else. Villard, a Random
House imprint, follows the same nomenclature.
Two smaller traps in the same family:
- A letter where you expect a digit. Harcourt Brace ran letters at the
head of the row,
Afor the first printing andBfor the second. Scribner's used a capitalAalone on the copyright page from about 1930 into the mid-1970s, with no line at all. - A line that means the opposite. Viking in the 1980s added a number line to reprints and omitted it from firsts. There, finding a line argues against the copy.
What to do when there is no line
Number lines only became general practice after about 1970, so most older books have none — and their absence says nothing at all. For those, the copyright page's stated line, the house's own convention for that decade, and the title's points of issue are what settle it. The full checklist walks the whole sequence.
Worth checking
A confirmed first printing is still only half the question — condition and the dust jacket move the price far more than most people expect. See Condition Grading, then check what copies are actually listed for with the free lookup.
The line in its proper setting, with the rest of the page printed around it, is what we drew as Anatomy of a First Edition.
Identification guidance only. Not an appraisal, and not legal advice. Where a point is not well documented for a given title, treat it as unverified rather than assuming.