As pointed out, this part of the ad is nonsense: "This meticulously maintained
1988 Olson 911SE, designed by the legendary George Olson,"
Like the Express 34 and 37 (great designs, IMHO) the Olson 911s is a Schumacher design. George Olson did design the 34, and it looks like he was greatly "inspired" by the 911s design.

I know that Schumacher was a bit miffed, from one email exchange with him after we acquired our 34.
One other niggle, the "TAFG" was kind of (?) a trademarked acronym at the time, and as such described an internal framing grid that went from one end to the other. Our Olson has an internal set of major frp sections that are 100% glassed to the hull and deck, as are all of the bulkheads. (!) The shipwright that did our re-fit was very complimentary of the engineering and build.
When we are "powered up" like we were last night in 18 knots, there was no creaking, groaning, or movement of any part of the boat... that's not true of some less-expensive boats I have crewed on over the years.
Opinions, especially mine, are all kinda subjective. But IF.... that 911s is really well maintained, the price appears very reasonable to me. Of course it's not my money at stake, either...
Edit: I would really be Really considering it, at the price shown in SA !!
All the best,
Loren