"Chasing something else like the Beckerflinte, Becker & Hollnder Waffenbau or just info on Becker and found some RW and RWS initials that caught my eye. RW and RWS just might be for Rmerwerk Waffenteilefabrik for a finite time span.
Vorbohren, bohren, reiben und honen - sources give that a large percentage of tubes at one time originated at Rmerwerk Waffenteilefabrik(1921-1931?)- Some give an origin prior to WWI. Friedrich Wilhelm Heym looks to have heavily sourced Rmerwerk and owned or absorbed it at some point(1931-1938).
"Jacob Roehmer, Suhl was the manager of the "Rmerwerk", mostly a machine shop and parts factory supplying the guntrade, though they made guns of their own too, like the unique "Roemerpistole",which could be converted to a selfloading rifle, or the selfloading "Beckerflinte" shotgun. Many "name" gunmakers like Dornheim, Greifelt, Thieme & Schlegelmilch, Stadelmann, several Kesslers, Funks, Jungs were shareholders."
http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=233908&Searchpage=1&Main=21498&Words=r%F6merwerk&Search=true#Post233908
I believe Emil & Ernst Kerner, Christoph Funk, Thieme & Schlegelmilch-mentioned above(later owned by Alfred & Ernst Funk), F.W. Keler(mentioned above) and a few others also sourced Rmerwerk."
http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=312878&Searchpage=1&Main=23624&Words=r%F6merwerk&Search=true#Post312878
Cheers,
Raimey
rse