2 - 742 BC - Does it matter?

The Jan 17, 2021 lesson (link below) in the Adult Sabbath School Quarterly on the book of Isaiah gave the date of the prophecy of Isaiah 7 (Syria's conquest of the northern tribes) as 734 BC, not 742 BC as our pioneers had established (see Millerite "1843 Chart" which was "directed by the hand of the Lord" EW 74.1). The "1850 Chart" also refers to the 7 Times or 2520.

Jan 17, 2021 Sabbath School Lesson
https://www.dropbox.com/scl/fi/2awrn0y4voeuufvwrnhql/Sabbath-School-Quarterly-Lesson-for-Jan-17-2021.pdf?rlkey=u3ditafffnav5s54lxavcbhro&dl=1

Original YouTube video: "742BC Feb2021" by People of the Book
https://youtu.be/jBwT0tI71XA?si=Vq1VRTzMYSVk468c