Interface Age Floppy ROM
6800 4k basic "Floppy ROM" from Interface Age magizine May 1977
I would be remiss if I didn't pass some reference to Mad Magazine and it's "It's a Gas" paper record
Interface Age [May 1977] at Archive.Org Page 28 has an editorial; "THE FLOPPY-ROM EXPERIMENT - Or the Joy of Developing a Simple Idea" Apparently introducing the concept, worked on by many individuals, manufacturers and publications, in the magazine.
Detail of groves
This floppy ROM has a slight crease. Inspection with my USB microscope. Looks salvageable.