There is a lot of information about BMW motorcycles available through the BMW Motorcycle Owners of America.
This is what the previous owner had to say about my R25:
This is a BMW 1951 R25/2 serial number 248735 (on both engine and chassis) with same year
Steib sidecar. A rare bike with a rare sidecar! The bike was purchased in Greece in 1975 by
the previous owners who spent several enjoyable years touring the countryside with it.
In 1984 it was dismantled and shipped to the USA. It was restored over a period of five
years and it and the sidecar are in fair running condition. There are a very few minor
scratches on the paint, there is virtually no rust but there is however a tear in the
driver's seat. The sidecar has a little rust which was taken care of during the restoration.
It could probably use a new paint job primarily because the striping was done by hand and
is a little wide. Everything on it is authentic.