I'm not sure if that main lever is save-able, all that pitting will cause a lot of interference with movement. I do love the look, even if it's a...
I'll click the inventor links or the "similar art" and sometimes you can find some other nuggets, also the links to other designs that reference...
Sharp 1987 https://patents.google.com/patent/USD305540S/en [ATTACH]
Toshiba 1988 https://patents.google.com/patent/USD310077S/en [ATTACH]
Sony 1992 https://patents.google.com/patent/USD309454S/en [ATTACH]
Sharp 1990 https://patents.google.com/patent/USD309454S/en [ATTACH]
Sharp TWIN CAM! from 1988 https://patents.google.com/patent/USD309454S/en [ATTACH]
Sharp 1987 https://patents.google.com/patent/USD306297S/en [ATTACH]
Samsung 1991 https://patents.google.com/patent/USD333136S/en [ATTACH]
Samsung 1990 https://patents.google.com/patent/USD329850S/en [ATTACH]
Philips 1989 https://patents.google.com/patent/USD317915S/en [ATTACH]
Here's a neat one from 1981, while similar to the Walkman II this has a built in radio. https://patents.google.com/patent/USD275391S/en [ATTACH]
Sharp Art Deco Boombox from 1986 https://patents.google.com/patent/USD297831S/en [ATTACH]
Saple International, Radio and Cassette Player 1991 https://patents.google.com/patent/USD320016S/en [ATTACH]
Sanyo Tape Player 1989 https://patents.google.com/patent/USD321687S/en [ATTACH]
From 1991, these Sony reference the ad which is odd since the ad is several years before the patent....
Some cool Sony Headphones from 1987 https://patents.google.com/patent/US4668842A/en [ATTACH]
Sony 1997 https://patents.google.com/patent/USD421753S/en [ATTACH]
Lenoxx from 1995 https://patents.google.com/patent/USD378370S/en [ATTACH]
Separate names with a comma.