Probably the 810 from c.1972, which was described as "transcription quality" and
looked the part with gimbal-type arm bearings, proper counterbalance, etc. etc.
http://www.vinylengine.com/library/bsr/810.shtml
However, the aforementioned book says its auto features "operated with all the speed and gutso of a dinosour", and that it was "big, cumbersome and heavy to operate".
The most common "upmarket" model you see over here is the MP60.
Nick.