For the 1976-77 season, their white home jerseys were crested with the same version used on their blue road jerseys, which had orange trim outlined in white to better separate the logo from the blue background. The net effect on the white jerseys that season was a simple orange outline to the crest, as the outer white layer simply vanished into the white jerseys.
It's unknown if this was a deliberate, considered choice or perhaps accidentally using road crests by mistake on the home jerseys, but the blue outline returned for the 1977-78 season, making the 1976-77 jerseys easily identifiable by their uniquely colored crests.
First today is a profile of Potvin from the fantastic "Legends of Hockey" series. Love him or hate him, this is well worth watching.