In the old city league, the team was known as the St. John's Jr. Blue Caps, but gained a sponsorship from Labatt Breweries in 1980.
In 1979-80, the Jr. Blue Caps lost only once and were winners of the Veitch Memorial Trophy as provincial champions.
By their third season, the 50's had won their first league title, their second Veitch Memorial Trophy in a round robin against the St. John's Jr. Shamrocks, and then their first Don Johnson Cup by defeating the Northumberland Junior B Hockey League's Antigonish Bulldogs in the final.
In 1987, two seasons later, the 50's won their second league title, again won the Veitch Memorial Trophy as Newfoundland Junior Champions, and then the Windsor Valley Jets 9-5 in the Don Johnson Cup final to clinch their second Atlantic Championship.
In 1988, they made it a third league title and Atlantic Championship to cap off a memorable run.