Library Stamps and Marks — Identifying Institutional Ownership in Rare Books

Library stamps, perforated marks, spine labels, embossed seals, and accession numbers are among the most commonly encountered provenance evidence in rare books. For provenance researchers, these marks trace a book’s institutional history — revealing which libraries held it, when it was accessioned, and sometimes how it left the collection. For collectors and dealers, institutional marks affect value, raise questions about legitimate deaccessioning, and provide a window into the centuries-long relationship between libraries and the books they steward.

Types of Library Marks

Ink Stamps

The most common form of institutional marking. Library ink stamps typically include:

• The institution’s name
• Sometimes a departmental designation (e.g., “Reference Room,” “Special Collections”)
• Sometimes a date of accession
• Sometimes a call number or shelf mark

Stamps are usually applied to the title page, the verso of the title page, or a designated page (often page 17 or another odd page, a convention whose origins are obscure but which many libraries followed). Some libraries also stamp the edges of the text block — the top edge, fore-edge, or bottom edge.

Blind Stamps (Embossed Stamps)

Embossed stamps that create a raised or recessed impression in the paper without ink. These are more discreet than ink stamps and may be difficult to see without angling the page to catch raking light.

Blind stamps were used by some libraries as a more subtle marking method, and by certain private collectors as well.

Perforated Stamps

Some institutions (particularly in the 19th and early 20th centuries) used a perforating tool to punch patterns of tiny holes in the paper, forming letters or symbols. These perforations are permanent and difficult to disguise, which was precisely the intention — to make the book permanently identifiable as library property.

Spine Labels

Library books typically carry spine labels with call numbers or shelf marks. Removing these labels leaves a mark — a rectangular area of discolored or damaged cloth/leather — that experienced buyers can identify.

Bookplates

Institutional bookplates are similar to private bookplates but identify the library. They may include:

• The institution’s coat of arms or seal
• A donation acknowledgment (“Gift of John Smith, Class of 1923”)
• An accession number
• Fund information (which endowment or donation funded the purchase)

Accession Numbers

Numbers written or stamped inside the book (often on the paste-down, flyleaf, or title page) that correspond to the institution’s accession records. These numbers can sometimes be used to trace when the book entered the collection and from whom.

Security Strips and Barcodes

Modern library books may contain magnetic security strips (embedded in the spine or between pages) and adhesive barcode labels. These are easily identified and relatively easy to remove, though residue may remain.

Identifying Institutions from Marks

Reference Works

De Ricci and Wilson, Census of Medieval and Renaissance Manuscripts in the United States and Canada — While focused on manuscripts, this reference includes information about institutional ownership marks.

Institutional stamp directories — Several compilations of library stamps exist for specific countries and periods, though no single comprehensive directory covers all institutions.

Online Resources

Many libraries have digitized their historical stamps and made them searchable. The CERL (Consortium of European Research Libraries) Thesaurus includes a growing database of institutional provenance marks.

Direct Contact

When a stamp is legible but the institution is not immediately recognizable, contacting the institution directly is often the most effective approach. Libraries are generally responsive to provenance inquiries about books that may have been in their collections.

How Library Marks Affect Value

The General Rule

Ex-library copies are worth significantly less than copies without institutional marks. The discount varies:

• 10–20% reduction for a single discreet stamp on the verso of the title page with no other marks — the mildest case.
• 30–50% reduction for multiple stamps, spine labels, pocket remnants, and other typical library processing — the standard case.
• 50–70% reduction for heavily marked copies with perforated stamps, edge stamps, security strips, and significant processing damage — the worst case.

Why the Discount

The discount reflects both aesthetic and practical concerns:

Aesthetic — Stamps, labels, and perforations detract from the visual appeal of the book.

Provenance — Institutional marks indicate that the book has been through library processing, which typically includes rebacking, relabeling, and other alterations that reduce collectible value.

Condition — Library use subjects books to heavy handling, which typically means more wear than privately owned copies.

Stigma — Some collectors simply prefer not to own ex-library copies, viewing them as inherently less desirable than privately owned copies.

Exceptions

Significant institutional provenance can actually increase value:

• A book from the library of a famous institution (the Bodleian, the Bibliothèque nationale, the Library of Congress) with a distinguished donation provenance.
• A book stamped by a historical library that no longer exists (a monastery suppressed during the Reformation, a Jewish institution destroyed during the Holocaust).
• A book with marks that establish it as part of a historically significant collection.

For very rare books — where only a handful of copies survive — the presence of library marks has minimal impact on value because collectors must accept whatever copies are available.

Ethical and Legal Issues

Legitimate Deaccessioning

Libraries routinely deaccession (remove from their collections) books that are duplicates, outside their collecting scope, or deteriorated beyond use. Deaccessioned books are typically sold, donated, or exchanged through legitimate channels.

Markers of legitimate deaccessioning:

• “Withdrawn” or “Discarded” stamps
• “Property of [Institution] — Withdrawn from Collection” labels
• Documentation (dealer purchase records, institutional sale records)

Stolen Library Books

Not all ex-library books were legitimately deaccessioned. Library theft is a persistent problem, and stolen books sometimes enter the market bearing institutional marks.

Red flags:

• Erased or obliterated stamps — Attempts to remove or conceal institutional marks suggest the book left the collection illegitimately.
• Missing pages with stamps — The removal of marked pages (particularly the title page) to eliminate evidence of institutional ownership.
• Recent institutional marks without withdrawal stamps — A book with a library’s accession stamp but no deaccession marking may not have been legitimately removed.

Due diligence: If you encounter a book with suspicious institutional marks — particularly if it is rare or valuable — verify with the institution that the book was legitimately deaccessioned before purchasing.

For Collectors

1. Ex-library copies are acceptable for reading and reference but are not ideal for serious collecting unless the book is very rare or the institutional provenance is itself significant.
2. Never remove or obscure library marks from a book you own. Removing provenance evidence destroys historical information and, if the book was stolen, may constitute evidence tampering.
3. Factor the discount into your purchase price. An ex-library copy should cost significantly less than a comparable copy without marks.
4. Examine ex-library copies carefully for all forms of institutional processing — stamps, labels, pockets, security strips, rebacking, call number marks — as these are sometimes incompletely disclosed in dealer descriptions.
5. For high-value purchases, verify that the book was legitimately deaccessioned if institutional marks are present.