From Popular mechanics:
http://www.popularmechanics.com/cars/news/pictures/10-modern-day-collectors-cars#fbIndex51986-1991 VW Vanagon Camper Syncro
There are very few Volkswagens that have earned collector-car status. Surprisingly, one is the classic Type 2 VW Microbus. A 1963 VW Samba Microbus went for $217,800 at a prominent auction this spring. Wow. The next generation of VW bus, the Type 3 from 1980 to 1991, has increased in value too?specifically the later Westfalia Camper models with four-wheel drive.
The reason is that these compact vans offer real 4WD capability and allow owners to camp just about anywhere. The Syncro (4WD) package included an ultra-low first gear in the five-speed transmission and came with an optional locking rear differential. Locking front differentials were even available in other countries. VW enthusiasts have built a cottage industry around these vehicles, and it is not uncommon to see them around the U.S. packing powerful Subaru engines.
In its last year, the 1991 VW Camper Syncro was fully loaded and had an MSRP of $26,475. Though NADA lists the high retail value for these at around $11,000, they tend to go for more on the open market. We saw one sell on eBay for more than $30,000. And modified ones with low miles are routinely listed for $40,000.
Read more: 10 Highly Desirable Modern Day Collector's Cars - Popular Mechanics