Several things noted, haha...good stuff here!
The pictures from the article posted way back up shows actually three versions of the front brake.
http://www.vintagemotorcyclesonline.com/features/stories/259-bsa-rocket-gold-star The two seen in the fancy red background page are the two factory brakes.
The composite picture way at the end of that 'Vintage' article shows just a peek at the Eddie Dow 'Duetto' 2LS plate and the looping cable behind it (yipes!).
http://www.vintagemotorcyclesonline.com/zenphoto/albums/VMOL%20wallpapers/british/RGS3.jpgThe 2LS is not factory of course but close as dammit since Eddie Dow got so much credit for the original RGS idea...his catalog must have been in every Rocker's bathroom.
A much better view of the Duetto 2LS plate on the 190mm is seen on the Bonhams sale bike front hub.
It's a right beauty I lusted for since I got my Eddie Dow catalog back in the late 60s...and seen in the catalog Viking linked to. (thanks Viking!!
The 190mm shoes measure 2", the single sided brakes were 1-5/8, then I also have a wheel with a single sided brake measuring 1-3/4" from a late A65 I think...so you might see three different brakes on an RGS now, the Duetto fit both the Single side as well as the 190mm. I think
(std disclaimer applies)Then Phil Pearson has a 2LS for both brakes shown on his site...is that the Duetto copy then?..
....pretty sure he inherited much of Dow's designs and inventory...maybe I remembered that right..
Also seen but not very well is the four CAST lugs on the front downtubes, the bigger wrapped reinforcement on the steering head, passenger loops R and L....part of a current and likely several past threads on BBike forum and here too....new info to me.
So, whats all this about different barrels and fins?... all I had registered before was thicker flanges at some point, what's the 411 on that?
standard disclaimer: I've been wrong before...Thanks all..