Anniversary · Calibre U30A · 2018 · twenty pieces

THE HALTER CIPHER

Each of the twenty Vianney Halter Anniversary watches carries two things: a line of enciphered text printed around the rotor, and a stepped grid of letters on its paper edition card — the card is the key, the rotor is the message. Both differ on every piece, and Halter built the edition so that it could only be read once the twenty owners shared what they had. This page is where that sharing happens.

The twenty watches. Recovered blocks are marked in gold.

01

The twenty watches

Two entries per watch: the key from its edition card, reproduced cell for cell including where each row starts, and the cipher line from its rotor. A watch counts as complete only when both are in.

capital letter — case is marked, so it carries meaning apostrophe — distinct from a comma

02

How to read it

Halter has confirmed the structure directly: the grid on the paper card is the deciphering key, and the line printed around the rotor is the enciphered message. Two artefacts, one purpose. It also settles a question this archive got wrong at first — the pixelated modular typeface had led to a guess that the text was Klingon, which nothing published supports and which the letters themselves contradict.

The key for no. 15 holds 38 letters. Between them they cover 24 of the 26 letters of the English alphabet — every one except i and l — but not evenly: a appears four times, n three, and nine other letters twice. So this is no bare alphabet listing; if it is a substitution table, repetition and position are part of how it works. The top row still stands apart, though not by width — the second row also runs ten cells — but by content: stuvwxyz, eight letters in sequence, then an empty cell and a lone mark, sitting above rows that resemble no sequence at all.

One rotor line is now in, and it talks back. No. 15's cipher runs 82 characters, all lowercase: 72 letters using 25 of the 26 — only d is absent — plus eight underscores (once doubled), a colon near the start and a full stop midway. Note that i and l, missing from the card, occur freely on the rotor: their absence is a fact about the key, not about the system. And between the two artefacts every letter of the alphabet appears — the card holds the d the rotor lacks. If the underscores are separators that survived encryption, the message has a visible shape: a lone t:, then runs of 9, 18, 13, 8, 14 and 8 letters, and a final single r. All of that is observation, not decoding.

Which raises the question the archive exists to answer. If every watch carries a key and a cipher, does each key decode its own rotor, or someone else's? Do the twenty keys combine into one table, or do they chain — 15's key opening 16's line, and so on around the circle? One watch cannot tell you. Two might.

Transcribe exactly either way. Capitals stay capital, apostrophes never become commas, blank cells stay blank. Under a cipher a single altered character is not a typo; it is a different answer.

Nothing here is decoded. These are observations drawn from one block, and one block is precisely the amount of evidence Halter designed this puzzle to make useless.

03

Send yours in

  1. Both halves count, and either one alone is still worth sending. The card gives the key; the rotor gives the enciphered line. A key with no cipher, or a cipher with no key, still moves this forward.
  2. Photograph both. Shoot the card square on. For the rotor, wind the watch so the printed band sits where you can read it and get as close as your camera will focus — the dot-matrix lettering is small and unforgiving.
  3. Type it row by row, one character per cell. Use spaces at the start of a row to push it across to the column where it actually begins. The stepped shape is evidence.
  4. Copy exactly what you see. Capitals stay capital — no. 15 has a capital S and a capital P among otherwise lowercase letters. Apostrophes sit high in the cell and commas sit on the line; they are different characters. If you can't tell, put a question mark, because a wrong character is worse than a gap.
  5. Give your watch number. It's what places your block against the other nineteen.

From the paper edition card. One line per row; leading spaces set where the row starts; use _ for a drawn-but-empty cell.

Straight through, left to right. Mark any gap or separator you see rather than closing it up.

Nothing is published until it has been checked against a photograph. Nothing about you is published unless you ask for it.

04

What this is

In 2018 Vianney Halter marked twenty years of his own name on a dial with the Anniversary: twenty watches, 38 mm, steel with gold rivets, calibre U30A turning under the patented sapphire mystery rotor. On each of the twenty rotors he printed one fragment of an encrypted message, built so that it could only be read once the owners shared it among themselves — his stated intention being to link the twenty of them to each other.

The connective theme runs deeper than the code. Halter has said that when the Anniversary took shape he knew he wanted to work with people he had an affinity for, and so he took the movement from a friend and fellow member of the AHCI rather than building it in-house — the first time a calibre in one of his watches came from another maker's bench. He has never named the friend. The watch world has generally settled on Andreas Strehler, an attribution repeated widely enough to be near-consensus but never confirmed by either watchmaker, and it is recorded here as exactly that.

Which makes the edition of a piece: a movement sourced from a friend, a case in a steel he had never used and has not used since, and a message deliberately broken so that twenty strangers would have to find one another to read it. The whole watch is an argument about being connected to other people.

This page is the pooling. It is run by collectors, has nothing to do with the atelier, and exists only so that twenty people don't have to be in the same room to read the answer.