As you said, wherever you see the names of NPHC orgs, you most likely see our founding years. Most Delta paraphernalia that I own says "DST 1913." The 9 NPHC orgs were all founded during a time in America when being a Black person on the street was tough, not to mention being in college, or a Black professional, and founding a GLO. The fact that these orgs were founded and have lasted 46-103 years with hundreds of thousands of predominantly African diasporic collegiate and alumni members is remarkable.
Shout it from the rooftops!!