Now that's BIG
After reading that you'd uploaded full size images, I went to my iMac and found a 27" diameter Snowflake!
Just a comment about movement finishing - the Spring Drive can be finished in many different style, depending on Seiko's choice - it's not that they can't do an artistic, hand-finished movement, but they chose not to do so.
Here's the same thing, inside my 10-year old, very very early Credor Moon, which is finished "Credor Style". Sorry I do not have the equipment to match your fine photos.
Everything is so reflective that the camera shows up even on the screw heads.