Round 1 wheel - October 1975

The Round 1 Wheel layout is changed, with the minimum now $100: the tan $75 becomes a second $500, the sole $25 becomes $300, the red $50 becomes $150, the yellow $75 becomes $200, and the blue $50 becomes $100. Based on available info about Round 3, the top value is still $1,000 and the sole $50 becomes $150.

Source: The Wheel of Fortune History Wiki.