23J? Anyone provide more info

[blind-m]

I'm looking for a U-BOAT U1001 but I'm having troubles. Trevor has this one

http://v.yupoo.com/photos/trevorwatch/albums/6010452/?style=story

But the movement is only described as 23J. There is a picture of the movement through the display case back. Can anyone provide more info on what this movement is?

Thanks

(PS saw the one in the sales threads here but want a movement better than 21J)

 

[Bonesey]

It comes in lots of variations, consider it the step between 21j and eta clones.