Bulova 1949 Shirley

Bulova 5AC, marked 49 (1949), case s/n J057245, 10K white gold filled bezel, stainless steel back.
Bracelet, white metal signed "Champion" (USA). I am unsure if the dial, bracelet, and crystal (10.25 x 11.25mm) are original, and from the ads, I suspect they are not. It's a tiny little watch!
After service on 6/04/2024, Weishi 1000 T/G values: +/-10sd rate, 200° amp, 6.0ms/be. But it runs!
Based on other identified watches on this site, here and here, I believe this to be a 1949 "Shirley".