The NASB 1977 is the original version preceding the NASB 1995 and NASB 2020 updates. It uses a very traditional style of old English that includes vocabulary, such as “thee,” “thy,” and “thou.”
This volume has one fatal flaw that keeps me from reading it on a regular basis – observe how the biblical text dives into the gutter and you have to crack the spin on the page you are reading to get a view of the text.