How many walkman models did Sony produce that had a 5 band equalizer?

There are very few. One is the WM-60. Another is a rare version of the WM-B39. I don't remember if there are more, but I'm sure a one or two more.

I think you are right!  5 five band Walkman is what I came up with. There is a TCM-7,  but It and others do not count.   The wm-60 is the most popular!  There is also a less known  but well done WM-104!    Also a five band, The WM-F60!   I am missing one or two!

There was the WM-F60, WM-60, WM-104 and some plastic jobbies

WM-36!  A cheep plastic one that was a U.K. Model I believe.  I know of one more cheep US model with am-fm, the wmAF-56.   Yes! 5!

The Lion posted 'The E.Q and the I.Q', it has lots of great info!  According to this post Sony  ever made a player with 4 band equalizer!

There's only one left: the WM-AF56, a cousin of the WM-B39 as I said. It's this one:

I got the Sony TCS-470.

It has a 5 band equalizer on the other side.