Its an interesting marking, because it really isn’t an intertwined “C” and “T”, or at least from the orientation of the two symbols, it doesn’t seem to be as the “C” would be backwards. It may just be a company trademark of some sort. I don’t collect these clips, but I have had many Springfield clips go thru my hands (I used to shoot a modified Remington 03A3 Springfield in matches, and then got a modified Springfield M1903 from a friend he used in the Camp Perry Matches in 1937, 38, and 39. It was rebarreled for him in 1939, with a new star-gauged barrel. It shoots better. I no longer shoot CF rifle matches, and used a NM M1 and a Match M1A (M14 type) until I quit. I still have the 03 Springfield and the NM Garand, although the latter needs tuning - it has lost its “gilt edge.”
I have used these clips and don’t recall ever seeing one with the trademark in question. Most of the clips I had were brass, although I had some steel, both with and without the little clips (which break off after a time) on the ends. I preferred the last version steel clip without the little projections, but never could find enough of them. They looked like the NATO charger but had two bumps on each side, like the normal, earlier 03 clips, and not just one.