Lotta dosh for a full back in 1990.
Totally worth it of course, he was great.
Not really - £625.000 was a fairly standard fee for a fullback at the time. Here are the most expensive fullbacks in 1989/90 and 90/91 - Irwin joined United in 1990.
1989 Peter Shirtliff was bought by Sheffield W for £500.000 - you are probably thinking .. who ? Exactly
1989 QPR signed Peter Bardsley for £500.000 (Phil's dad) - a solid yet unspectacular fullback
1989 Spurs signed Pat van der Hauwe for £575.000 - his biggest achievment was being a solid 28 year old fullback with 13 caps for Wales
1990 Charlton signed a mediocre John Humphreys for £450.000
1990 Everton and City made a trade - Hinchcliffe went to Everton and Neil Pointon went to City - they were valued at £1.4 m and £600.000 respectively.
1990 Norwich signed Paul Blades from Derby for £700.000 - played both centrally and fullback.
1990 QPR signed Clive Wilson from Chelsea for £450.000
So a lot of mediocre fullbacks cost more or less the same - like Blades, van den Hauwe or Neil Pointon. But the one that really sticks out is the swap involving Andy Hinchcliffe and Neil Pointon - where Everton paid Manchester City £800.000 with Neil Pointon (valued at £600.000) going in the opposite direction, to sign Hinchcliffe.