The Practitioner's Mark, explained

A Practitioner makes two choices. The first is the shape: one of shield, rectangle, arch, oval, lozenge, or cushion. The second is the lettering: one or two serif initials. Together they make a mark that is legible at the size a Hallmark is struck and distinct from the marks already on the Register.

The set of six is closed and will not be extended. A small, fixed vocabulary keeps every mark readable down to a couple of dozen pixels, where an open library of ornament would blur into decoration. The constraint is the same one that has kept assay marks legible on silver for centuries: few shapes, drawn precisely, struck small.

Two figures resemble a Practitioner's Mark but are never issued as one. The circle is reserved for the Date Letter, which records the year an Engagement was Hallmarked. The touchstone is reserved for the Assayer, which records who certified it. Keeping these two outside the Practitioner set means the four parts of a Hallmark can never be confused for one another: the shape alone tells a reader which part of the mark they are looking at.

The mark is struck into every Hallmarked Engagement the Practitioner builds. It sits first in the four-part composite — Practitioner, Standard, Assayer, Date Letter — and is entered, with the Engagement, on the public Register. One Engagement is a single record. A career of them is an account of craft that a reader can verify line by line: what was built, against which version of the Standard, certified by which Accredited Assayer, and in which year.

Because the mark is registered to the individual, it is portable. It does not belong to an employer or a Platform, and it is not reset by a change of either. The record accumulates for as long as the registration stands, and remains on the Register afterwards, because the Register is permanent.