Thanks to Mike V., I decided to look at this website so I could see this R25 of which he posted a picture.
I found this neat ad that I had never seen before. Quite a few for the R45/65, all in German, of course.
(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fwww.pbase.com%2Ftomfarr%2Fimage%2F125695933%2Foriginal.jpg&hash=563552f0066e272d54154adc231e4534f11bb741)
[size=18]"After the Deluge."[/size]
Since I don't know how to use the website, I just did a search on motorcycles with a keyword 'r'.
That returned 5283 hits!
That should keep me busy most of the evening.
http://www.bmw-classic.com/2/webmill.php?id=158074&