For jazz vinyl collectors and audiophiles, holding an original 1950s or 1960s Blue Note Records release is the ultimate milestone. Known for their distinct laminate covers, high-fidelity mono mixes, and iconic typography, these records represent the pinnacle of the hard bop era.
However, navigating the secondhand market—especially on platforms like Discogs or at high-end European and American record fairs—requires precise technical knowledge. To avoid paying premium prices for later reissues, a serious collector must master two physical characteristics of the vinyl itself: the Deep Groove (DG) and the Flat Rim.
Here is your definitive guide to identifying these legendary pressing variations and understanding their impact on value and audio quality.
1. What is the Blue Note “Deep Groove”?
The term Deep Groove refers to a physical, circular indentation pressed into the label area of the vinyl. This groove is a byproduct of the older pressing machines used by Plastylite, the custom pressing plant in New Jersey that manufactured Blue Note’s records until 1966.
The Mechanics Behind the Groove
The indentation was caused by a raised metal ring on the pressing machine’s die (the mechanism that clamps down on the hot vinyl biscuit).
- The Standard Deep Groove: Measures approximately $2.75\text{ inches}$ ($70\text{ mm}$) in diameter. It forms a distinct, heavy valley that runs right through the text of the Blue Note address.
- Why it matters for authenticity: Most Blue Note titles released between BLP 1501 (1956) and BLP 4100 (1962) originally featured this deep groove on both Side 1 and Side 2.
Collector’s Note: As Plastylite updated their machinery in the early 1960s, “non-deep groove” (or flat label) dies were introduced. During the transition period (1961–1965), it is common to find “incidental” pressings with a Deep Groove on one side only.
2. Understanding the “Flat Rim” (Flat Edge)
If you go back even further into the mid-1950s—the era of the Lexington Avenue labels and early 767 Lexington addresses—you will encounter the Flat Rim (often called Flat Edge).
Flat Edge vs. Guard Groove
- Flat Rim (Pre-1958): The outer edge of the record is completely flat and uniform in thickness from the groove area all the way to the rim.
- Beaded Edge / Guard Groove (Post-1958): Newer pressing molds introduced a raised, thickened rim at the very edge of the vinyl (also known as the Groove Guard). This was a structural improvement designed to prevent the stylus from sliding off the record when using automatic record changers, and to protect the music grooves from scratching when records were stacked on top of each other.
If you find a copy of Miles Davis’ Volume 1 (BLP 1501) or Hank Mobley’s Hank Mobley Quartet (BLP 1504) with a completely flat outer edge, you are looking at an exceptionally rare, first-generation pressing.
3. Visual Identification Guide
To verify if your turntable-ready investment is a true first pressing, use this quick checklist when examining the vinyl surface under a strong ledger light:
| Feature | First Pressing Era (Highly Valuable) | Later Pressing Era (Mid-Value) |
| Outer Edge | Completely Flat Rim (No raised edge) | Beaded Edge (Raised outer rim) |
| Label Indentation | Deep Groove ($70\text{ mm}$ heavy circular indentation) | No Deep Groove (Smooth, flat paper label) |
| Deadwax Stamp | Handwritten or stamped “Ear” (Plastylite P) + “RVG” | Stamped “VAN GELDER” (No Plastylite “Ear”) |
4. The Audiophile Veredict: Does it Sound Better?
Does a Deep Groove or a Flat Rim record sound inherently better than a smooth-label reissue? Technically, no.
The physical shape of the paper label or the thickness of the outer rim does not interact with your phono cartridge or stylus. The legendary “Blue Note Sound” was entirely the work of recording engineer Rudy Van Gelder, who mastered the lacquers with high levels of compression and a forward-sounding midrange designed to make horn sections jump out of mid-century Hi-Fi systems.
However, there is an indirect sonic advantage:
Records pressed using older, flat-rim and deep-groove dies were manufactured during the first run of the master metal parts. This means the stampers were fresh, resulting in less surface noise, sharper transient responses, and a more vivid presentation of the acoustic space compared to pressings made years later from worn-out tape copies.
5. Summary Checklist for the Smart Buyer
When sourcing early Blue Note jazz vinyl, always confirm these three elements simultaneously:
- The Address: The label address must match the release year (e.g., 767 Lexington Ave, 47 West 63rd New York 23, or New York USA).
- The Deep Groove: Check both sides. A double-sided DG commands a massive premium over a single-sided or non-DG copy.
- The Deadwax: Look for the hand-etched cursive letter “P” (the Plastylite “ear”). Without the ear, the record was not pressed by Plastylite, meaning it cannot be an original pre-1966 first pressing—regardless of what the label address says.
By mastering these subtle structural details of vintage vinyl fabrication, you protect your collection’s value and ensure your high-fidelity audio setup delivers the most authentic hard bop experience possible.