Its should be capable of video chats, so front cam and internet connectivity camera are a must.
There are a lot of chinese phones, none of them have 4G (I beleive only Samsung s3 and LG Urbane2 have 4g but they lack camera)
Some of them have side looking camera (in place of watch crown). Some run proprietary system, so no hangouts or Skype.
This one probably will do https://www.gearbest.com/smart-watch...pp_589679.html
If only it had 4g...
This one fits the bill MWC 2017: Hands-On with Omate 4G Connected Smartwatch - Sports Wearable
but boy, isnt it ugly!