As of today, (july 2015), 2998’s from one owner sources have all but dried up, compared to two years ago. In 2012 several good “Owner Watches” were traded in the $4000-6500 range. It is difficult to say what they are worth today, as these watches do not show up.
The watches today are mostly offered through dealers, like this one:
This watch is typical of the kind of thing I am seeing from dealers who do not (yet?) have the detailed knowledge that an informed collector has. This watch has a dial from a 105.003, service hands and bezel. So the only original things might be the movement and case, and that cannot be guaranteed.
Chrono24 has six 2998’s as of today, and range from $6500 to $22,000. Interestingly as of today the most expensive one is on hold. See it here:
This watch is pretty much correct, and has the more attractive (to me) triangle lume in the hour hand. Still, anything over $20,000 for a black dialed, DO90 bezel 2998 is something I have not seen until now.
These summer months are notorious for thin markets, and I will wait until September before I draw solid evidence for a major shift in prices in the Price Chart – but I feel it may be coming.
For comparison here is an exceptional 2998 purchased recently, from the original owner, for more than I wanted to pay. Look at that dial!