From the Chip Guide:
"The attribution of these chips to the "Weeping Willow" (Lincoln, CA) is in doubt. The "MO" and "O&F" HHL-mold chips were shipped by C. W. Rice between 1962 and 1972 to the ”505 Club” (Sacramento, CA) which had a card room during the 1960s"

And for the 505 Club Sacramento CA:
"C. W. Rice shipped 2117 of the the"MO" and "O&F" HHL-mold chips in six colors to the 505 Club at 507 12th Street between 1962 and 1972. These chips had traditionally been associated with the Weeping Willow (Lincoln, CA), but that attribution is now in doubt."

So, maybe I need to put this chip in a newly labeled holder.