What factory is this? and it's a 31mm datejust, that's a women's datejust collection, usually it's equipped with 2236 movement which I don't think is a sw movement. However I could be totally incorrect, please let people roast me if I'm wrong.
Can't see the entire balance, but it reminds me of the old WM9 subs which used a small ETA movement like that with a large spacer ring. They are good movements. They were originally designed for women's watches which is why they're so small. I attached a picture below of my WM9 for comparison.