Gani Ahmed Nigam struck a brace while super sub Balkar Singh scored the third goal to hand the Indian Super League franchise, FC Pune City's U-19 side a glorious win at Mohun Bagan ground.
The loss meant Mohun Bagan failed to win a trophy this season with the senior team finishing second best in I-League and Federation Cup.
Once a premier tournament in the Indian football calendar running into 121st edition, the Shield has been reduced to an U-19 affair three seasons ago.
Minutes later, he doubled the lead from a spot kick, while some sloppy goalkeeping by Sanjay Bhattacharya saw Mohun Bagan concede a third with the ball going in between his legs.
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Coached by Spanish coach Roger Lamesa Grau, Pune showed fine promise with Gani leading from the front with four goals from five matches en route to winning their second title in two months. They won the Goa Super Cup in May.
This was also their second win over Mohun Bagan, having beaten the Kolkata side in the group B league with Gani scoring the solitary goal.