an image of a texas instruments ti55 scientific/engineering calculator
Brand Texas Instruments
Type Scientific/Engineering
Release Date 1977
Display Type LED
Serial Num. 3737282
Date code ATA3580
Country of origin N/A

Acquired as part of a lot of 18 calculators on July 8, 2022. According to the date code this calculator was manufactured in the 35th week of 1980 in the USA at the Abilene, TX plant. I have not yet confirmed whether this calculator is functional or not. The original battery pack no longer functions and needs to be either refurbished or replaced with a modern battery solution.