From:Joep van der Steen e-mail:joepvdsteen-A-gmail.com
Subject:rear wheel hub Date:Sat Feb 20 13:08:31 2016
According to the spare part catalog there have been a number of different rear hubs over the years.
I'm restoring a '51 machine but have no clue if this is the correct one (guess it is, but no idea what the differences are)

thanks
Joep