Don't know of a Gibb ZL1 group photo. Would have been impressive but all 50 were never there at the same time.
Berger was definitely one of but not the first. Emmert Chev also had a hook at Central Office and is supposed to have ordered 20 L72 COPOs. Several were RS, some special paint. 4 still around. Earliest is N591194, built on or about Feb 4 a month prior to the first Berger COPO.
I'm aware of the Courtesy COPO N578203 but it remains controversial.
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