Many year's ago you did have to get a C210 endorsement before they bought in the group endorsement's.
A CP that I worked for showed me his licence with all the single engine endorsements and ranged from C150, C170, C175, C172, C182, C205, C206, C207, C210, Victa, PA-18, PA-28/140, PA-24, Auster, Chipmunk and Tiger Moth.
Don't mention it to loudly otherwise CASA will reintroduce as a stealth way to raise revenue!!!!