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From this photo it appears to be a 321 movement but sharper images and more than one image that shows the detail of the parts would be better for analysis. As you mentioned some of the finish appears to lighter than you may expect. Was it recently cleaned and serviced? Are all the large head screws sunk to the normal depth? Can't see the jewel bearings very well. Maybe more photos if you can get them. Lighting in the photo may cause the plating to look off.
The balance bridge looks correct. The u shaped bridge feels earlier.
the tan triangle near the top doesn’t look like an omega ordered finish.
The tan triangle?
I was thinking the triangle at 9:30 in your picture.