Tommy, these did not have TTO knobs, they had Barrel handle end knobs. The cases seem to be different for the Single Ring most likely for economic reasons. The size difference of the razors dont seem to be significant for Gillette to alter the size unless the were trying to save on case materials.Last night I just noticed that my two cases with the slide latches, ( Double Ring and Early 1905 Single Ring), which have the same ful info. on the bottom are actually different sizes! The Double Ring Case is larger, taller and has a thicker top lid. Both cases have the 3 Hole Blade Stamp with the $5.00 Price and the 12 Blade Info. on the bottom. I showed the pictures of my Early Single Ring, and now want to discuss my Double Ring. I acquired it nearly a year ago on "The Bay". It is "THAT RAZOR" which has been discussed on B&B since about 2010. It has a "C" Prefix on the Inner Barrel. (C 53742). There has been various discussions about this; as to whether it is a Real 1905 DR or a Mixed Matched Razor. There were also ideas, that perhaps it came from the 1906 Montreal Plant. The tooling on the "C" seems to be unique, and the last letters placed on the barrel were the B series for U.S. Single Rings. I believe it to be the Real Thing, from all I have read. The TTO knob shows more use, but I have seen some DR'S with way more wear on the knob than the handle. If it is decided to not be the Real Thing, it is still a razor in great shape that I used today to shave with. I would welcome more input on this. Here are some pictures of the two sets, and the size difference of the cases.
What do you mean by " The tooling on the "C" seems to be unique, and the last letters placed on the barrel were the B series for U.S. Single Rings"
Are you saying the markings of the numbers were identical to the Single rings numbers so it may be mis-matched barrels?