This is a rather amusing application of the word "vintage." All this type of Sony stereo microphone that I've ever heard--and I've used eight or ten different models over the years--have been quite peaky in the treble, and quite fatiguing to listen to for any length of time. The sonic concept was that of "clarity" and "presence" and "crispness" as hallmarks of "high fidelity" sound, and the ability to understand spoken words in a recording was paramount.
I truly think that (despite the photos in their advertising) they were designed for recording business meetings, with musical applications as an afterthought at best. That would certainly explain their generally very wide pickup angles, which aren't usually so practical for recording music.
--best regards