I was under the impression that those 3-6-9-12 dials were used on the earliest of Constellations rather than a Cal 551 (Which the seller refers to as a 561)

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I've seen a couple of them. That one's a redial, very polished and has a whole bunch of other problems. Here are some more:

 

Yea it looked all kinds of wrong, I was really curious though as to whether the 3-6-9-12 layout was used on these alter connies as opposed to just early Cal 352/354 bumpers

 

Yep, the style is also available for Cal. 50X Constellations as well. Borrowed pic:

 

Ahk cool, that's what I was curious about. I know Mike has a thing for the 352 versions of those dials but I wasn't sure if they were unique to those.

 

I think this style was used in all of the early chronometer calibers from 352 through 551, except the 504 calendar.

IIRC, there was a cal. 561 calendar version as well.

Hope this helps,
gatorcpa