What a beautiful car. Obviously a lot of work and care put into it, nice to see a diesel 7 series get some love. Wonder why the owner is selling, it looks like one that would be worth keeping.
This looks to me like a 1984.5 model BTW, for what it's worth. In other words it is really a 1985 model but with a 1984 VIN. That is a good thing IMHO since the 1984.5 and later cars are much easier to find parts for (interior, brake, suspension, body etc) as they are common with all the later years. The 1983 and early 1984 cars are oddballs and very rare nowadays.
Hope this one ends up in good hands, thanks for sharing it. RedArrow maybe you need a lower mileage sedan companion to your red wagon!