Interesting!
I did not know that they ever made a stainless witness??
anyway, the ones shown sure look like the Wonder finish to me, as JWC mentioned its a silver tennifer type finish.
I have 2 of them an older model and a new model and many mistake them for a brushed stainless.
I also have a witness elite match that has a Hard chrome frame, it also looks like a polished stainless but its not.
the wonder finish has held up well for me so far.