I love Bernina's. I have the 440QE, 830 record, 730 record, and a 1630. My understanding is that the 801 is the 830 model but with fewer stitches and no knee lift. (The 803 that Prism99 mentions is yet another model number in the 800 series.)
Based on what I heard, the serial number indicates it was made in 1982. (I heard that if you add 60 to the first two digits of the serial number, that will tell you the date of the machine.)
There is an 801 Sport model as well which is a portable machine and has a handle. Please confirm that you are looking at the full sized 801 machine rather than the Sport. The information I gave on the 801 does not translate to the 801 Sport.
I use Google to search for "Bernina 801 sewing machine" and there is a lot of information out there; including the prices other folks have paid. I tend to be very patient in obtaining my machines since I don't NEED any more machines. (But I would be happy to add this 801 to my collection at the right price!!!) Personally, I would buy this at $50 for myself. However, if my daughter or friend wanted a machine I think I would be very happy to pay $150 to $200 for this machine if it is in good condition and has the feet, case, extension table, etc. included with it. I assume it is in good working condition based on your comments but its wear and tear would need to be checked out. This is just MHO.
Let us know how this turns out! I hope you are soon the happy owner of a vintage Bernina machine!!!!!