Wow, what a deal!!! I would love a 930. I bought a Bernina 910 as a backup machine (to my Bernina 440 computerized machine). It's a basic model of the same era as the 930, it has no decorative stitches and no knee lift. Yet, it is the same Bernina quality.
The info about the heel tap for needle down/up doesn't always hold true. Mostly, but there are exceptions. My 910 is dated 1983 (serial number begins with 23), but it does have the heel tap. The foot control type that came with the machine is a better indicator (although the foot control could have been replaced). The type 366 foot control would have come with the heel tap machine, type 347 foot control would be earlier without the heel tap.