TickTock Wear is a Wear OS (Android Wear) application that adds a ticking sound to your smart watch.

Other features:
•  Restrictions: time, battery percentage and charging status
•  Additional sounds (Premium)
•  Hourly chime with volume and duration settings (Premium)

TickTock Wear supports Android Wear 2.0+ devices with a speaker. At the moment of writing these are devices that meet the requirements:
•  Asus ZenWatch 3
•  Asus ZenWatch 2
•  Huawei Watch 2
•  Huawei Watch
•  LGE LG Watch Sport
•  GLE LG Watch Urbane 2nd Edition
•  ZTE Quartz
•  Fossil Wear
•  Fossil Q Wander / Q Marshal / Q Founder 2.0 / Bradshaw / Dylan
•  Mobvoi TickWatch Pro / TickWatch Pro 4G
•  Mobvoi TickWatch S / E
•  Verizon Wireless Wear24