Born in Caernarfon in 1942, Wyn began his professional career with Wrexham, after spells with local clubs around the North Wales area where he worked as a quarryman.
He rose to wider acclaim in the 1960s, first with Bolton Wanderers (74 goals in 170 games) and then at Newcastle United (53 goals in 216 games), whom he helped to win the 1969 Inter-Cities Fairs Cup.
The Wales international (34 caps) moved to Manchester in 1971, and spent one season with City before joining the Reds in mid-September-1972 for a fee reported to be around £65,000.
In one season at Old Trafford, he scored four times across 17 appearances, before moving on to Blackpool.