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SYNCHRONAR 2100

"World's First Solar-Powered Watch"

Operating Instructions


The SYNCHRONAR is the very first LED watch.  There were a number of fully working SYNCHRONARs in use prior to PULSAR's staged prototype demo in May of 1970.  In spite of this, PULSAR is often incorrectly credited as the first LED watch.

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.
  • 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)

Synchronous Chronometer Calendar