OK Chaps. I have now looked and disassembled my floor tom (I'll do the BD later). From the pics you can see that the screws holding the lugs to the shell are different ... however, the sleeves still only poke halfway through the shell. I have attached a pic that shows the two lugs: the small tom has the screw type screw & the floor has the hexagonal screw. Another pic shows there's a difference in the casting of the lugs, while the length of the sleeve remains the same. I've also attached a pic that shows how far in the sleeve extends, same as the small tom. If the small tom lugs were MIJ, then the floor tom would be original I think, but still have short sleeves!
Lastly, the screws that hold the legs, as can be seen, are different again, and I have not removed one to see how far into the shell they extend!
Something about these floor tom lugs makes me think they are US original. What does the team think?