is this rotor correct...never saw one that small

123836258636

:BGW:

I saw that auction listing but skipped over it and did not notice how funny the movement looks.

The movement is a Day-date AS base and does not match the case it is with as it is a later movement.  They just grouped them because they both said Zodiac.  The reason the movement looks so funny is that the rotor is only half there.  The larger, heavy weight outer portion of the rotor is gone and it is just left with the signed inner core.