It appears to be very similar to my Necchi BU. I will guess the BF is an earlier, straight stitch only. My Necchi BU is zig-zag with a more modern looking tension adjuster. I like my BU, it is a tank and a wonderful sewer - not fun to lug around. However, I've recently fallen in love with the 66 and 15 series Singers and my wife says some have to go. The Necchi will be on the chopping block eventually. Best of luck. You got a good price. If unable to refurbish yourself, it's worth having someone CLA it for you. But, like Joe says, try the wires if it runs intermittently, but if it tries to run and won't, then it needs major cleaning. I would do both.
Ron