Last seen on April 13th 1996 when that gentleman of the game Alex Ferguson attributed United being 3 - nil down at half-time to the grey shirt's previously unheard of attribute which enabled it to function as an invisibility cloak of some sort.  
For the second half, United emerged in a blue and white kit and showed Southampton who's boss, not conceding further and even bagging one themselves towards the end thanks to Ryan Giggs.
The grey kit was never worn again and this immaculate version of it is a must-have.
Invisibility cannot be guaranteed by us here at H&W, unfortunately, as this is a second-hand item.