The WM-D6 at first looks like a rather large personal stereo, but is really more like a miniaturised TC-D5 portable cassette deck.
The WM-F20 was very similar to the WM-F10. The only changes of note were that the hinges and slides were made a little stronger...
DD2 had the addition of Dolby B noise reduction, and many minor improvements.
In the WM-10 family of super small Walkmans, now with the controls on the front (instead of top), and auto-reverse.
A distant relative of the expandable WM-10 family, now with recording and radio but without the sliding mechanism and 2xAA batteries in the Walkman.
To describe the WM-F75 as a WM-75 with a built-in AM-FM radio...
The smaller Walkman Professional recorders, a DDII with additional components for recording borrowed from the WM-D6C.
Walkman that parted from the conventional, hard-edged form for softer contours that fit comfortably in your hand.
The WM-R202 was very similar to the WM-102, but with one important difference, it could record.
