A working Chrome Smiths Astral Radio Room clock with a 6" (15cm) dial and slow/fast switch.
The sinking of the Titanic resulted in the Radio Act of 1912 that required 24-hour radio watches. The disaster also led to clocks in the newer radio rooms featuring three-minute periods marked in red. That three minutes provided a silent period when only emergency radio messages could be transmitted.
Measures 9cm deep