Glynneath captured the Silver Ball from last season's winners Maesteg Quins with a splendid second-half comeback after being 10-0 down at the interval, to come away with a 13-10 victory.
It was the first time in 49 years that Glynneath had won the coveted trophy, having won in 1961, 1962 and 1963.
The Quins battled hard to hold on and after an even first 29 minutes, Quins captain and fly half Gareth Lewis laned a penalty and the the first try came seven minutes later.
Glynneath full back David Evans was caught and Quins centre Ryan Lovett beat off defenders to score with Lewis converting.
In the second half, Glynneath used the strong wind well, particularly through their young fly half Jack O'Reilly.
It was O'Reilly's clever coss-kick that sent wing Jonny Morgan over after 47 minutes and O'Reilly added the conversion. After 62 minutes, Glynneath were awarded a penalty but as referee Gwyn Morris played advantage, O'Reilly dropped a smart goal.
Glynneath centre Kyle Roberts was unlucky to be red-carded for a second bookable offence, but 14-man Glynneath won it when O'Reilly placed a penalty with eight minutes remaining.
The man of the match award was made by former international referee Cliver Norling who selected the young Glynneath lock Lloyd Bayliss.
The Silver Ball was presented to Glynneath centre and captain Greg Roberts by Mr. Richard Davies, Accounts Manager of Molson Coors.
Maesteg Quins Try: R Lovett. Con: G Lewis. Pen: G Lewis.
Glynneath Try: J Morgan. Con: J O'Reilly. Pen: J O'Reilly. DG: J O'Reilly.
GB7s women left their England base to train in Wales this week. Olympic Games hopeful Rachael Burford gives WRU TV's Graeme Gillespie her thoughts on Welsh teammate Jasmine Joyce - a 'one touch wonder'
The GB7s women's squad is currently training at Wales' Centre of Excellence where assistant coach Richie Pugh tells WRU TV's Graeme Gillespie some 'tough calls' will have to be made when it comes to finalising the 12 spots for Rio's Olympic Games.
Wales U20's Billy McBryde is looking forward to starting his first game against New Zealand this afternoon in the World Rugby U20 Championship where his side are looking to gain revenge from last week's pool defeat to the Kiwis.