The Four Little Shavers were a rare Pizza Time Theatre show that was exclusive to the Ice Cream Emporiums - a concept Ice Cream Parlor that was test marketed at select locations. The Shavers sang barbershop quartet songs, and their showtape consisted of vintage 1950s recordings from one of the most famous barbershop quartets of the era, the Buffalo Bills1.
The characters from left to right are named Nolan (holding the towel), O'Nolan (holding the cup), Curly (the bald one in the chair), and McNolan (holding the broom)1. The clever naming system was homage to PTT's founder Nolan Bushnell.
The Four Little Shavers were typical of the early multi-character PTT shows and had very few movements. They were a retrofit of The Beagles, and each character could move their heads, body, and mouth. Curly had the most movements, as he could move and raise his arms.
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References
1 - PTT Theatrical Standards Manual