80's style half half ski hats

Ajax' Sonny Silooy holding a half Ajax half United hat after winning the European Cup Winners Cup in Athens in 1987 (Ajax-Lokomotiv Leipzig). 

Click on the pic to enlarge it. 

  

A few reds at the same game.

 

Combinations that you won't see a lot these days.

The infamous one from The Firm (West Ham & Celtic).

Several more, friend and foe:

Ajax, manchester united, rangers, celtic, brazil, charlton, millwall, sheffield wednesday, leeds, forest, tottenham, sunderland, coventry, wales, wolves, antwerp, feyenoord, palace, hearts, liverpool, juventus, everton, city, plymouth argyle, walsall, villa, fulham, aberdeen, brugge, stoke, birmingham, bradford, oviedo, partick thistle, qpr, shamrock rovers, hibernian, napoli, wrexham, derry city, st pauli, bohemians, luton, portsmouth, dundee united