Ive had this Yingchun for some time now.
I like it, condition issues and all.
It features the "correct" ZTZA movement.
We have seen a number of examples of Tianjin brand watches with a J dial, but have you seen one with a B dial?
This is the only one Ive seen. I was curious about it, because even though it is a Tianjin brand watch, the black striped dial and the indices remind me of some Yingchun or Zhufeng watches. The back is plain, and the crown is unmarked.
Of course I tried to open it to see what movement is inside, but in spite of all of my attempts the back will not budge.