That is correct. But an additional caveat is in order because I'm fairly sure I have seen it on other movements at some point. I was referring only to movements in this movement family. Beyond that, I've also never seen it on any of the movements that I'm tracking. (SN ranges 120k-150k, 327k-347k, 450k-740k, "Main Sequence" or whatever you want to call it, focusing on Precision Factory output.)