SC 210 ALT: Appeared in 1941 or 1942 as new primary routing running from SC 210 Columbia Rd (now US 21-178 CONN) southeast to US 21/SC 2 (now S-38-94) St Matthews Rd.
In 1947, SC 210 ALT became SC 210. Today it is S-38-25 Boulevard St.

SC 210 ALT in Orangeburg - note there are two US 21s and two SC 210s marked, so one of each of those are ALT routes.
1947 City of Orangeburg