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.
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.