1976 Texas Instruments LED TI 501-1 Digital Watch - YouTube
File:Vintage Texas Instruments Series 500 Men's Digital Quartz Watch, Red LED Display, Original Band, Made In USA, Circa 1970s (32105401646).jpg - Wikimedia Commons
Starburst LCD Analogue watch by Texas Instruments | Science Museum Group Collection
Refurbishing a Texas Instruments Series 500 LED watch | WatchUSeek Watch Forums