The lugs on S/L drums are not plastic. They are steel. They are the same lugs as the Ludwig Standard models.
Ok I just remember them not being chrome and not feeling the same as on my Jazzfest and smaller club date toms. That being said the S/L snare is not a bad sounding drum.
Honestly sometimes anything goes with Ludwig I just have not seen that snare in a catalog or one like it show up often. That does not mean much of anything with Ludwig though.
If you are happy with how it sounds, looks and what you paid for it then it should not matter really. I would only care if it was advertised as something and you paid for something it was really not.