Where Is the Matrix Number on a Vinyl Record? How to Find and Read the Deadwax
Updated: 4 days ago
Where Is the Matrix Number on a Vinyl Record?
On most vinyl records, matrix and runout information is found in the smooth-looking area between the end of the recorded grooves and the centre label. Collectors commonly call this area the deadwax or runout. The information may be stamped, hand-etched, or a mixture of both.
The important point is that not every mark in the runout is the matrix number. The same area can also contain cutting or mastering marks, engineer initials, facility or pressing-plant identifiers, job numbers, crossed-out information and other manufacturing inscriptions. Record what is physically present before deciding what each mark means.
How to find the runout information
Hold the record by the edge and centre label rather than touching the playing surface.
Look at the area immediately after the final recorded groove and before the centre label.
Use soft, angled light rather than staring straight down at the surface. Shallow stamped or etched characters often become clearer as the light moves across them.
Rotate the record slowly. A complete runout inscription may be spread around several positions rather than appearing as one continuous line.
Inspect Side A and Side B separately. Each side can carry different matrix, cut and manufacturing information.
If the characters are very small, use a magnifier or a clear macro photograph rather than rubbing, tracing or marking the surface.
How to transcribe what you see
Write the runout exactly as it appears before researching it. Preserve letters, numbers, hyphens, punctuation, crossed-out material and unusual symbols as accurately as possible. Also note whether important marks appear stamped or etched when that distinction is clear.
Do not silently “correct” a character because an online database shows something similar. Your first record should describe your physical copy. Database entries become comparison evidence afterwards.
If one character cannot be read confidently, preserve the uncertainty. FTD uses [?] rather than inventing a letter or number. A partial but honest transcription is stronger evidence than a neat transcription containing a guess.
Matrix number, label matrix and catalogue number are not the same thing
Some records also print a matrix-style number on the centre label. That printed label matrix can be useful evidence, but it should be recorded separately from the inscription physically present in the runout. Likewise, a catalogue number belongs to the commercial release framework and may resemble part of the matrix without being interchangeable with it.
A practical observation record
A useful first-pass note might read: “Side A runout: ABC-123-A-1, stamped; additional etched initials; one small symbol [?]. Side B runout: ABC-123-B-2, stamped.” This records the evidence without pretending that every element has already been decoded.
What finding the matrix number can tell you
Once accurately transcribed, matrix and runout information can help distinguish manufacturing variants, cuts or production relationships. It can also provide clues that can be compared with documented mastering, plant or manufacturer systems. The meaning is contextual: the same-looking suffix or symbol can mean different things under different companies and periods.
Finding a low-looking suffix does not by itself prove first pressing, earliest retail copy, rarity, value, sound quality or provenance. Those are separate conclusions requiring separate evidence.
FTD method
OBSERVATION — locate the runout and transcribe both sides exactly.
INTERPRETATION — separate the likely matrix from other marks and compare them with documented manufacturer-specific evidence.
CONCLUSION — state only the level of pressing or variant identity that the combined evidence supports.
FTD principle
Good transcription begins with safe observation. Find it, record it, preserve uncertainty, then research it. Unknown is better than invented.
Related guides
Guide 03 — What Is Deadwax on a Vinyl Record?
Guide 01 — How to Read Vinyl Matrix Numbers and Deadwax
Guide 04 — Vinyl Matrix Numbers Explained
Guide 14 — How to Photograph Vinyl Deadwax and Matrix Numbers
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