We have the full, complete, unassailable answer to all questions about Blue Note and the flat edge, thanks to the Blue Note expert Larry Cohn and Don-Lucky for reaching out to Larry. We will also be posting Larry’s comments on the deep groove as well. Here’s the information on the flat edge:
“Here’s some information on the Edges/Rims. The change from Flat Rim (aka Flat Edge) to Safety Lip occurred in 1957. It was in response to new industry standards, occasioned by the popularity of automatic changers, whereby disks were routinely stacked and would fall on each other, the way we recall handling 45rpm disks. To lessen the damage to the LPs, the Safety Lip, also called a Groove Guard by one of the companies, was created at the edge of each side of the disk to keep the actual surfaces of the two disks from touching each other when they came into horizontal contact. It also protected the needle, since
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