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A matrix number is an alphanumeric code (and on occasion, other symbols) stamped or handwritten (or a combination of the two) into the run-out groove area of a phonograph record.

The size is the most notable difference in the performance of 78 shellac records and 33 or 45 vinyl records. The 45s are typically 7 inches, but 78s and 33s can be either 10 or 12 inches. What differences should you be aware of when deciding which record you want to play on your turntable?

Many first pressings will display text like ?A//1? on the record's A-side dead wax, and ?B//1? on its B-side. These markings are called matrix numbers, and they will often be the first thing that people look at to determine a record's pressing number.

To put simply, the catalog number is the ?fingerprint? of your vinyl record which identifies it and gives it a specific ID, making it unique, identifiable, and traceable.

Look at the label: Many records will have the RPM printed on the label, usually near the center hole or on the back cover. Measure the diameter of the hole: A 33 1/3 RPM record will have a large hole in the center, while a 45 RPM record will have a smaller hole, and a 78 RPM record will have a very small hole.

Frank Wilson ? "Do I Love You (Indeed I Do)" (SOUL*35019, US 7-inch 45 rpm in plain sleeve, 1966). One of two known copies of this Northern soul classic fetched over £100,000 in 2020, ing to the Harborough Mail. Northern soul is a highly collectible area, based around obscure American soul singles.

Look at the label: Many records will have the RPM printed on the label, usually near the center hole or on the back cover. Measure the diameter of the hole: A 33 1/3 RPM record will have a large hole in the center, while a 45 RPM record will have a smaller hole, and a 78 RPM record will have a very small hole.