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SYNCHRONAR 2100

"World's First Solar-Powered Watch"

Operating Instructions


Inventor Roger Riehl began development of his SYNCHRONAR wristwatch in 1959 and claims it to be the very first LED watch.  According to Riehl, there were a number of fully working SYNCHRONARs in use prior to PULSAR's prototype demo in May of 1970.

On this site you will find:
  • Synchronar documentation - Synchronar specs, features, and complete online documentation consisting of scanned copies of the original manuals for the Mark I and the Mark IV.  Also inventor Roger Riehl's original patent for the watch.
  • Riehl Time Archives - Rare material beginning with Roger Riehl's first digital display from 1952; and also including the 1971 newspaper article announcing the launch of his watch with a photograph of one of his fully-functional 1960s prototypes. (Currently under repair/construction)
  • Links - to other Synchronar sites.
  • The Digital Watch Forum - a discussion area covering all types of digital watches.  A short-cut to this forum is now available at the easy-to-type URL dwf.nu, where "dwf" stands for Digital Watch Forum.
  • Photographs of my Synchronar and v-tec alpha.
Astronaut Gorder Cooper is impressed:


visit newdwf.com

Own the World's most perfect watch
(original Popular Science advertisement)

Synchronar:  Synchronous Chronometer Calendar

Holliston, Massachusetts