In the mid 1980s, I did a very abused/neglected 1964 R-60 sidecar model, mated to a Globe (Bombay) sidecar. I sold it in 1999 as it took up more room than I had to spare. I was pleased with the outcome, but the subject of this thread is really a few increments above mine. I'd expect it to go for $12-15K. Mine went for $8K 22 years ago. There is a magic in old /2 Beemers with sidecars.
Ralph