This exact question was asked about 6 months ago.
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Buconero117 is saying 48% of MSRP (with the caveat that it only applies to speakers less than 10 years old). Although the Dynaudios in question were released in 2000, his ballpark estimate is right on Bluebook for 2 models and WAY off on the 3rd. I'll let the original poster subscribe and figure out which is which.
I believe the Contour 1.3SE used to be Dynaudio's top-range bookshelf monitor before the Confidence range was launched. They are about the same level as the current S1.4, perhaps close to the Confidence C1's performance. Some folks may pay close to used S1.4 prices for the 1.3SE even though they don't cost much during their days. I wouldn't be surprised if the 1.3SEs list for 20% or 30% off their MSRP in today's market, since the current prices of most high-end gear(Dynaudio higher-end models being one of them) have been inflated.
Finally figured out how to see my archived sales.
I sold a pair of the 1.3SEs on 8-29-11 for $1050. They were listed as a 6 because of a couple of small chips in the gloss black finish. Mine did come with perfect grills and all original packing and manuals.
I've seen a couple other pairs listed since then and I'm thinking they were listed for $1600-$1700. They weren't listed long so I assume they sold quickly.