You knowledgable people helped me once before to identify a rare Venus 140 movement.
Here's another tester which has so far defied my attempts at Identification.
This is a 13 lig movement in a 34mm double hinged case.
Birmingham Swiss import marks for 1926.
I have serviced this watch and there is no makers marks anywhere.
It is marked Swiss made on barrel bridge and Swiss under the balance.
There is a serial number 28743 on dial side of btm plate.
It is a very good quality movement having pearlised plates and bridges.
Ruby olive jewels set in gold chatons, a highly polished escapement with split compensation balance and overcoil hairspring. It is slightly unusual in that the third wheel is mounted on the barrel bridge.
It has five adjustments.
Perhaps someone can ID it and put me out of my misery?