WM-103

The WM-103 is one of Sony's slimmer playback-only Walkman models of 1987, using an all-metal body just under 20 millimeters thick while still fitting auto-reverse, Dolby B noise reduction, and support for normal, chrome, and metal tapes. A hold switch, LED indicator, and optional external battery arrangement keep the player practical without disturbing its clean rectangular proportions. The overall design leans toward restraint, with very little surface detail beyond the confidence of how compact and solid it feels.

This model comes from a point when Sony had already solved most of the technical problems and was refining the object itself. The WM-103 is not trying to define a new category or branch into radio, recording, or gimmicks. It is a disciplined version of the late-1980s Walkman idea, meant for users who simply wanted a slim player that worked and stayed out of the way.