SC 26 ALT #1: Appeared in Nov 1937 (SCDOT) based on a 1936 Act of SC Legislature as a renumbering of SC 26 through Eastover. Shown but not labeled on official maps, and is explicitly mentioned in the 1937 SC Highway Department Annual Report.
By 1942, SC 26 ALT became SC 764 south of Eastover and SC 263 north of Eastover.

SC 26 through Eastover 1935 Official

SC 26 ALT loop through Eastover 1937 Official

SC 26 ALT becomes SC 263 and SC 764 1942 Official