'78 R100/7 '69 R69S '52 R25/2
Will you visit Munich?. Back when BMW Group Classic was Mobile Tradition, I was able to arrange (in advance) a meeting with the vintage motorcycle guys and got a look at the unrestored projects in the warehouse and copies of some prewar documentation. Worth a try if you have time.
In years past I enjoyed visiting the Deutsches Museum in Munich, but a recent visitor said it was getting a bit worn.
Enjoy your trip!!
Also, Spandau, of course, is right there and they do factory tours, I think you have to book those in advance and I have not done one of those tours!
Make sure you book a boat trip on the Spree river, a great way to see Berlin - I hear the bicycle tours are good also.
Enjoy, Berlin is my favorite!