Interesting. I'd like to see the serial number but my guess is that it might be a '66 or early '67 that was converted to a SF II. The Chesterfield inlay on my '67 has the lines in it. I think the bass in question does not have the lines, but it is hard to tell from the picture. Tuners and truss rod cover look ok. Neck PU looks like an original Bi-sonic or a much, much later Dark Star. Bridge PU looks like a Guild humbucker which came out in '71. PU toggle looks wrong. There is no suck switch - excuse me, "bass boost" - which reinforces an early date. No master volume either which reinforces the idea that the second PU was added. Bridge looks right for late '66 through some time in '67. The thumb and finger rests are in the right position for a '66 SF I but not a '67 SF I, but they look out of proportion to me. I believe, however, that those rests were not stock on a factory SF II. Anyway, based upon the picture, my memory and archives, I'd say what we have is a '66 or '67 SF I that was converted to a SF II in '71 or later. The person who did the conversion made the effort to use a Guild PU and Guild knobs but not a Guild toggle or the Guild wiring that included a master volume. Not sure about the rests. I'd guess they were both moved on a '66 or just the treble moved on a '67. Definitely not the original position for both but if only one moved then '67 would be it. $1,400 does sound "reasonable".