I am selling parts from a '68 Ludwig set and the cymbal stands have the block logo on them while the snare drum, a supra, with a '67 date, had a p-83 with the block logo on it (which I had thought were only normal for Ludwig standard snare drums). I have no reason to believe it was switched. I think they must have came with some hardware discrepancies various periods especially when they're transitioning to the block or parallelogram logo or from a rail mount to a post mount system, etc. Don't forget this is a factory where orders are still coming in and parts are laying around. Well, maybe not in disarray, but still not all neat and cut-and-dried.