RGS has used various makers over the years for special runs of guns. Don't recall the details, but I picked up a Garbi 20ga boxlock, used, for our RGS chapter as a sponsor raffle gun. I also recall that there was a special run of RGS doubles, 20ga again, that were Uggie 75EX sidelocks.
Larry,
I seem to recall that RGS also had a special run of some Kimber Valier sidelocks (Turkey) available as banquet/sponsor guns, maybe 15 years ago. The didn't do well in the US marketplace and were gone soon thereafter. RGS sold them off at a pretty hefty discount, if I remember correctly.
NB