Texas Instruments 1975 Electronic Calculator with Memory TI -1250 original box | eBay
Vintage Sinclair Cambridge Scientific Electronic Pocket Calculator, Red LED 8-Digit Display, Made In England, Circa 1975 | Pocket calculators, Calculator, Slide rule
Vintage Calfax Electronic Pocket Calculator, Model 890 P, Red LED Display, Made In Hong Kong, Date Stamped July 30, 1975 | Pocket calculators, Calculator, Red led
The Pocket Calculator Race
File:Vintage Hewlett-Packard Model 21 Electronic Pocket Calculator, Made in the U.S.A., A Scaled-Down HP 25, Circa 1975 (11574422413).jpg - Wikimedia Commons
MakerMobile on X: "This 1975 TI calculator was given to me in parts. I cleaned it, rebuilt it and converted it to lithium power. I just love it :-) #TBT https://t.co/iIfLod8eQW" /
HP-35 - Wikipedia
File:Vintage Texas Instruments Model SR-50A Handheld LED Electronic Calculator, Made in the USA, Price Was $109.50 in 1975 (8715012843).jpg - Wikipedia
1975 advertisement for Qualitron calculators : Free Download, Borrow, and Streaming : Internet Archive
Found & fixed up a rare working Sharp's first pocket scientific calculator PC-1801 (1973) with red LED pictured next to a PC-1802 with VFD (1975) and financial EL-8200 with VFD (1975) : r/calculators