an image of a Texas Instruments SR-40 scientific/engineering calculator
Brand Texas Instruments
Type Scientific/Engineering
Release Date 1976
Display Type LED
Serial Num. 9800373
Date code LTA4976
Country of origin USA

Acquired as part of a lot of 18 calculators on July 8, 2022. According to the date code this calculator was manufactured in the 49th week of 1976 in the USA at the Lubbock, TX plant. I have confirmed that it is functional using a 9v battery, however, the original battery pack is no longer functional and will either need to be refurbished or replaced with a modern battery solution.