That is the correct box. The old model Super Single Six has the adjustable sights and the 6.5" barrel version was catalog number SC6.
But what is interesting is that that is one of the rarer "error" boxes where the printer mixed up the caliber marking with the marking for the fixed sight 6.5" RSSM (which was always noted as a .22 WMR and then the second cylinder was the LR). The common SC6 box just says .22 Caliber Revolver. They made a run of RSSM boxes with the opposite error as well.
In this picture, the boxes on top have the normal markings and the ones below them are the error printings: