Selling inherited maps

Most of the maps we're asked about arrive this way — out of an estate, an attic, a flat file in a basement, or a box bought at an estate sale for eleven dollars. The owner usually has the same three questions in the same order: what is this, is it worth anything, and who do I sell it to?

The honest answer to the second question is that inherited maps span an enormous range. Plenty are decorative reproductions worth very little. Some are original engravings from a broken atlas worth a few hundred. Occasionally something in a box of otherwise ordinary material is worth thousands. The gap between those outcomes is almost entirely a matter of identification — which is why the worst thing you can do is guess and act on the guess.

First: don't do anything to them

This is the only genuinely urgent part of this page. Well-meant tidying destroys more value in inherited maps than damp and sunlight combined.

• Don't clean it. No erasers, no bread, no cleaning products, no water. Foxing — those brown speckles — is normal for paper of this age and buyers expect it. A cleaning attempt that goes wrong is permanent and obvious.
• Don't tape or glue anything. Not on the front, not on the back, not "just to hold the tear together." Adhesive tape stains through paper over time and its removal is a conservator's job. A clean tear is much less damaging than a taped one.
• Don't trim the margins. Not to fit a frame, not to square up a ragged edge. Original margins are part of what a collector is buying.
• Don't try to flatten a rolled map by weighting or ironing it. Brittle paper cracks along the fold. If it's rolled, leave it rolled.
• Don't throw out the surrounding material. A detached atlas title page, an index leaf, or the covers of the book the maps came out of can matter — sometimes more than one of the maps.

If the maps are somewhere damp, move them somewhere dry and flat, out of direct sunlight. That's the full extent of the intervention worth making before you know what you have.

What inherited maps usually turn out to be

The material we see from estates falls into a few recognisable groups:

• Atlas plates. Single sheets removed from a bound atlas, often with a centrefold running down the middle and text printed on the back. The centrefold isn't damage — it's evidence of how the map was originally published.
• Wall maps and school maps. Large, sometimes mounted on linen with rollers. Condition drives value here more than anything, and they're frequently in rough shape.
• Sea charts. Sparse-looking, heavy on soundings and coastal detail, light on interior geography. Often undervalued by non-specialists precisely because they look plain.
• County atlases and plat books. Late-19th-century American, often with landowner names printed on the parcels. Interesting to genealogists and local historians, and value is very location-dependent.
• Framed decorative prints. The largest group, and most often 20th-century reproductions rather than originals.

Is it an original or a reproduction?

This is the question that decides everything, and it's genuinely difficult from photographs alone — but there are useful tells.

An original engraving or etching was printed by pressing an inked metal plate into damp paper. Under a raking light you can often see or feel the plate mark, a faint impressed rectangle just outside the printed image, and the ink of the lines may sit very slightly proud of the surface. The paper itself is usually laid or wove rag paper, sometimes with a watermark visible when held to a window, and it will look uneven rather than uniformly white.

A modern reproduction tends to give itself away under magnification: a regular pattern of coloured dots rather than continuous engraved lines. Modern paper is often brighter, smoother, and dead flat, and hand-colouring on an original sits within the lines with slight variation while printed colour is perfectly registered.

If there's a whole collection

A collection is a different problem from a single map. Someone assembled it deliberately, which usually means there's a theme, and the value is rarely spread evenly — it's common for two or three sheets to carry most of it while the rest is filler.

That has one practical consequence: don't let the whole group be priced as a box. Estate sale companies and general antique dealers routinely average across a lot because that's how they work at volume. Any buyer worth talking to will identify the strong pieces individually. If you have more than a handful, photograph the group and the notable individual sheets — you don't need to shoot forty maps to start a sensible conversation.

Also look for the owner's own records. Collectors keep receipts, catalogue annotations, and correspondence, and finding a dealer's invoice from 1994 in the back of a flat file tells you more in ten seconds than a week of searching.

A note on estates with more than one heir

If the maps are part of an estate still being settled, make sure whoever is administering it is in the loop before you sell anything — and if the proceeds are being divided, a written evaluation is worth having on record even if you don't sell. Nobody wants to discover afterwards that a sibling thought the map was worth ten times what it fetched. This is a practical point rather than a legal one; anything touching probate is a question for the estate's attorney.

How to photograph them

Every evaluation you'll get, from anyone, depends almost entirely on the photographs. Good ones take five minutes:

• Lay the map flat, near a window, in indirect daylight. Overhead room lighting produces glare and colour casts.
• Shoot the whole sheet straight on, with all four margins in frame — not cropped to the pretty part.
• Close-ups of the title or cartouche, any signature or imprint line, and any text in the lower margin. This is what identifies the map.
• Close-ups of any damage — tears, stains, holes, repairs. Hiding these wastes everyone's time, and a buyer who finds them later withdraws.
• The back of the sheet. Printed text on the reverse is one of the most useful identification clues there is.
• Something for scale in one shot — a ruler or a coin at the edge.

If it's framed, photograph it in the frame rather than dismantling it. Removing a map from an old frame can tear it, and glued backings are best left to someone who's done it before.

Then decide where to sell

Once you know roughly what you have, the routes are auction, a dealer, a marketplace like eBay, or a direct buyer — and they differ mostly in what they cost you in commission, time, and work. We've laid out all of them, ours included, in where to sell antique maps, and covered the kinds of buyers in this market in who buys antique maps.

What we do is straightforward: you send the photos, we research the map against comparable sales, and within 48 hours you get either an offer or the questions we need answered first. If it turns out to be a reproduction, or something not worth buying, we'll tell you that plainly — that answer is free and it's often the one people actually needed. We buy below retail, as every buyer does, and we'll tell you what the number is based on.