what is the longest consecutive losing streak between 2 LPD football teams?

My guess is the PV-Pound series, Pound has not beaten Powell Valley since 1985, does anyone know 1 that goes back longer?

I know that teams have skipped years playing each other and then started playing again. Like pound has not beat gate city since 64, but Gate City left the LPD soon after and pound did not play them again until 3 or 4 times in the 80's, then the 2 teams didn't meet again until GC came back to the LPD most recently.