Here are two uncomon watches with Beijing SB5 movements. SB5 was a modefied SB-2 movement that was made on an imported Swiss Enicar production line.
Guangzhou's SB5 movement is slightly different as I tried to replace a second hand shaft with a Beijing SB5's but it would not fit.
The Mudan(peony) was made by Luoyang Watch Factory in Nenan province. These are less common early products by both factories.