Unspecified / 1931
Synchronous and bichronous clocks
Synchronous and bichronous clocks
The Smithsonian catalogs Synchronous and bichronous clocks as books in its Clocks and watches records.
WHY IT’S INTERESTING
Trade literature.
A CLOSER LOOK
The Smithsonian lists the object under Clocks and watches and dates it 1931.
Trade literature.
FOLLOW THE EVIDENCE
Smithsonian InstitutionSynchronous and bichronous clocksOriginal explanation based on the sources above. Images carry their own reuse terms.