2000 D-EJ610
The D-EJ610 appears to have sat in the same practical early-2000s family as the D-EJ611, combining G-Protection and a compact two-AA layout with the kind of feature set meant to disappear into routine use.
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The D-E660 is a straightforward early-2000s CD Walkman built around G-Protection, simple controls, and a practical two-AA layout in a compact body. Its feature set stayed focused on stable everyday playback instead of on expansion or experimentation.
By this point, the category had become highly predictable in the best possible way. The D-E660 was part of the part of the line where the main job was no longer to impress but simply to work reliably without drawing attention to itself.