The IV and V do, I am not so sure about the III. Oh, maybe the III is the one with a space on the chassis for the add-on MPX. If so, it may or may not be present, depending on the specific unit (most likely, depending upon the fiscal priorities of its original owner!).
I realize this is an unsolicited opinion, but I'll repeat my oft-stated bias -- I don't think most folks will miss MPX stereo FM too much after spending some quality time listening to a very good mono tuner. The backwards-compatible FM multiplex system we have had since 1961 is pretty amazing technology -- but one does pay a price for stereo (in terms of signal to noise ratio, distortion, and HF performance) when that little light comes on.
Here's my S-3000 V. It actually replaced my (mono) S-2000 (and despite my 'anti-stereo' screed above) in my 'real' hifi when we moved to the new house full-time.
Sherwood S3000 V 2 by
mhardy6647, on Flickr
(I need to take a better photo of this tuner -- it's not really a pretty face, but a better-sounding tuner, mono or stereo, would cost considerably more than this one)
EDIT: The "V" is probably the least desirable cosmetically, I'd opine. It has a rather pedestrian little FM center-channel meter instead of the waterfall "magic eye" signal strength "display", a literally tacked-on "Sherwood" label, and generally just bland-er cosmetics than the earlier Sherwoods. The earlier models are certainly...
idiosyncratic cosmetically
... but they're somewhat more attractive (IMO) than this late vacuum tube-era product.
Here's an (unsuffixed) S-2000 for comparison (with an ill-fitting metal cabinet; sorry about that!)
S2000 by
mhardy6647, on Flickr