Somebody scratched a message into the master by hand
The blank run-out groove of a record is the one place a human being can leave a mark, and the good etched messages are addressed to nobody.

TELL THEM I TRIED, scratched into the blank run-out in uneven hand cursive. Beside it, stamped cleanly rather than written, the matrix code A1 HRV-114. The groove lines curve away from both, toward the label.
One of those two marks was made by a machine. The other was made by a person who knew almost nobody would ever look that closely.
What is a run-out groove?
The blank, unmodulated ring of vinyl between the last track and the label, where the needle spins uselessly once the music has finished.
It carries no audio, which is exactly what makes it useful for something else. Because nothing on it has to be music, it's the one part of a record where a mastering engineer — or anyone with access to the lacquer before it's pressed — can leave something by hand that plays no sound at all and shows up on every copy pressed from that master.
Why is the matrix code stamped there?
Because every copy pressed from the same master needs a way to be traced back to it.
A matrix code identifies the specific master a record was cut from — which session, which side, which pressing run — and it's stamped rather than scratched because it has to be legible and consistent across thousands of copies. It's bureaucracy, not decoration, and it sits in the same ring as the handwritten message purely because that's the only blank space available on the disc.
What makes a good etched message?
Restraint, mostly — the good ones read like they weren't written for an audience at all.
A message crammed with a name or a date reads like a signature, which is a different thing. The ones that last are short, slightly cryptic, and addressed to nobody in particular — a line that means everything to whoever cut it and nothing you can look up. TELL THEM I TRIED works because it doesn't say who "them" is or what was tried; the not-knowing is the whole appeal.
Can I scratch in a message that copies a real record's run-out?
A real etching is a specific person's handwriting on a specific master, made at a specific moment, and it belongs to whoever cut it the same way a signature does.
Copying one exactly borrows a private moment that wasn't addressed to you. Writing your own message in the same format — hand-scratched, short, slightly cryptic, sitting beside an invented matrix code — uses the format without taking anybody's actual words, and the format itself has no owner.
Does this work for a message to someone specific rather than to nobody?
It works either way, and they read differently.
A message addressed to nobody has the appeal of a private thought left where it might be found. A message addressed to one person — initials, a private joke, a line only they'd recognise — turns the same blank ring into something closer to a note passed in secret, hidden inside an object that looks, to everybody else, like an ordinary record. The same choice comes up on anything etched or branded rather than printed.
If almost nobody finds it, why put it there at all?
Because the odds of being found aren't the point — the fact that it's permanent is.
A run-out message survives every pressing taken from that master, for as long as the master exists, regardless of whether a single listener ever notices it. That's a different kind of durability from a note left somewhere it might get thrown away — closer to a high score nobody's watching for, still sitting there the next time somebody looks.
Does it print well?
The two elements print very differently, which is worth keeping rather than smoothing over.
The stamped matrix code reproduces cleanly as fine, even type — flat colour, hard edges, no issue at chest-print size. The scratched message wants to look genuinely hand-drawn: uneven line weight, a slight wobble, nothing traced too cleanly, or it stops reading as something scratched by hand and starts reading as a font pretending to be one.
How do I get one made?
Describe it at JustOG — what the message says, who it's for if anyone, and what matrix code to stamp beside it. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.
Designs other people have published are in the shop.
A groove that plays nothing, carrying the only line on the whole record nobody edited.