![Vintage Sinclair Cambridge Scientific Electronic Pocket Calculator, Red LED 8-Digit Display, Made In England, Circa 1975 | Pocket calculators, Calculator, Slide rule Vintage Sinclair Cambridge Scientific Electronic Pocket Calculator, Red LED 8-Digit Display, Made In England, Circa 1975 | Pocket calculators, Calculator, Slide rule](https://i.pinimg.com/originals/5f/42/22/5f42227d6dbc394136bc724f14624df1.jpg)
Vintage Sinclair Cambridge Scientific Electronic Pocket Calculator, Red LED 8-Digit Display, Made In England, Circa 1975 | Pocket calculators, Calculator, Slide rule
![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 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](https://upload.wikimedia.org/wikipedia/commons/a/af/Vintage_Hewlett-Packard_Model_21_Electronic_Pocket_Calculator%2C_Made_in_the_U.S.A.%2C_A_Scaled-Down_HP_25%2C_Circa_1975_%2811574422413%29.jpg)
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
![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 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](https://i.pinimg.com/originals/31/f6/49/31f649f2c3e996cd75afc909a5716365.jpg)
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
![File:Vintage Texas Instruments Model SR-50A Handheld LED Electronic Calculator, Made in the USA, Price Was $109.50 in 1975 (8715012843).jpg - 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](https://upload.wikimedia.org/wikipedia/commons/thumb/c/ca/Vintage_Texas_Instruments_Model_SR-50A_Handheld_LED_Electronic_Calculator%2C_Made_in_the_USA%2C_Price_Was_%24109.50_in_1975_%288715012843%29.jpg/1610px-Vintage_Texas_Instruments_Model_SR-50A_Handheld_LED_Electronic_Calculator%2C_Made_in_the_USA%2C_Price_Was_%24109.50_in_1975_%288715012843%29.jpg)
File:Vintage Texas Instruments Model SR-50A Handheld LED Electronic Calculator, Made in the USA, Price Was $109.50 in 1975 (8715012843).jpg - Wikipedia
![File:Vintage Texas Instruments Model SR-16-II Pocket Calculator, Made in the USA, Price Was $44.95 in 1975 (8721189640).jpg - Wikimedia Commons File:Vintage Texas Instruments Model SR-16-II Pocket Calculator, Made in the USA, Price Was $44.95 in 1975 (8721189640).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/d/df/Vintage_Texas_Instruments_Model_SR-16-II_Pocket_Calculator%2C_Made_in_the_USA%2C_Price_Was_%2444.95_in_1975_%288721189640%29.jpg)
File:Vintage Texas Instruments Model SR-16-II Pocket Calculator, Made in the USA, Price Was $44.95 in 1975 (8721189640).jpg - Wikimedia Commons
![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 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](https://preview.redd.it/found-fixed-up-a-rare-working-sharps-first-pocket-v0-cv4zt37tz8bb1.jpg?width=1008&format=pjpg&auto=webp&s=d0cfb3e1d9668d6e3f05993f965a33154fecc10f)