Royal Blue Jersey
Player Valuation: £35m
The most significant of all time was that of WR Dean in 1925 from Tranmere Rovers for £30.
This. The greatest goalscorer this country has ever had. Unparalleled. His name is still universally known in this city 33 years after his death and 85 years since he broke records.
But I understand the OP's point. As far as unheralded signings go, Super Kev was special