[Solved] Trying to identify this movement to reassemble the calendar.

Top view. 

Looks like an ST16 or 2813 variant. Below is something similar, hope it helps!

Here is the dial side of one with everything in place (factory direct with fingerprints and all!):

Here is with the cover disassembled (3 plate screws removed):

Be careful that the spring (still in place on your movement, out of place in the picture above near 27 on the datewheel) doesn't pop out of place.

Here is with the datewheel off:

And another macro view:

Here is something similar on Amazon.