As @fanoush says, getting the phone and the watch right next to each other would be a good idea. Even if the antenna somehow came disconnected in transit (there is a string contact from the PCB to the antenna) you should be able to see it with your phone (just at very low signal strength).
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Sorry - I don't see a screenshot there...
As @fanoush says, getting the phone and the watch right next to each other would be a good idea. Even if the antenna somehow came disconnected in transit (there is a string contact from the PCB to the antenna) you should be able to see it with your phone (just at very low signal strength).