Retro Clock Widget. Seems like a Mechanical Flipping Retro Clock. (no flipping animation). Totally FREE application. No advertisement or any other disturbing items. 5 Retro Widgets. Application contains only widgets. Date widgets will open your default Calendar application. (shortcut to Calendar). Clock widgets will open your default Alarm application.
A free .apk file of Retro Clock Widget 1.0.1 is available from Droid Informer and you can read users' reviews on this site. Prepare 419 KB of free space on your device for this app setup package and take into account that it works fine on Android 4.1 and above. According to the antivirus report, the app doesn't contain viruses or any kind of malware. This application was originally created by MobileRise and it refers to the Personalization category.
Over 100K users downloaded and set up Retro Clock Widget and the latest update was on Jan 10, 2018. On Google Play, the app was rated 4.2 by its users. This application is often downloaded by Samsung and LG users.
From the users' point of view, the strong side of Retro Clock Widget is a nice design.