DCF600HS - Rail Mount DCF77 Clock with Serial Port
DCF77 - Wikipedia
Remote controller for Clocks (IKEA and others, DCF77, WWVB, MSF, JJY) – SensorsIOT
Dcf77 Receiver Module | Radio Module Antenna | Dcf77 Clock Module | Radio Time Module - Tool Parts - Aliexpress
DCF600HS - Rail Mount DCF77 Clock with Serial Port
GitHub - veebch/clock: Running an old secondary clock, using DCF77 or WWVB and Raspberry Pi Pico. Also a version that does not use Radio and uses a Pico W.