I actually believe I remember this…. Hahaha
The bevels happened on regular and R. Taylor at about the same time. At first they were only on the GS/RT1 size.
I ordered my RT2 12 fret cutaway when they finally started offering the bevels on Grand Concerts, in 2011.
As soon as I saw the presentation series with the first beveled GC I asked Tim Luranc to make Bob let RT do the same. I knew they had the tooling going next door.
Fortunately someone else wanted the same thing, so with potential orders for two, the RT style 2 got the option for the last year or so they built RTs.
The bevels were happening on the GA and GS well before 2011.
Happy hunting
Paul