Runout marks can include letters, numbers, signatures and logos related to manufacturing or mastering. Their meaning depends on the release and the documented company or engineer; there is no universal symbol key.
Pressing plant or mastering mark?
Do not assume every symbol identifies a pressing plant. A mark can be associated with another stage of production. Compare the identifier description and company credits in a reliable release reference.
Photograph before interpreting
Use light from the side, rotate the disc and capture the mark from several angles. Note whether it is stamped, etched or crossed out. Include the surrounding characters so the symbol is not separated from its context.
Why one mark cannot prove a first pressing
A reused identifier, a variant or an incomplete transcription can lead to several candidate releases. Match both sides, the labels and packaging before describing a pressing. Do not treat a suffix such as A1 as universal proof.
Matrix numbers on CDs are a separate topic
A CD matrix and SID-code search is not the same task as reading a vinyl runout. If you arrived from a CD query, use the identifier guidance for that medium rather than applying vinyl assumptions.
What to send for help
Share artist, album, catalogue number, photos of both labels and complete runout transcriptions. Mark uncertain symbols with a question in your notes rather than guessing their meaning.
Keep reading
Vinyl Matrix Number Lookup: A Step-by-Step Search · Vinyl Record Types
Reference and review
Format, identifier or equipment reference · Reviewed 17 October 2026. Read the instructions for your exact release and equipment.