This is a very rare new old stock Lockheed brake bleeder tube and tin for Jaguar XK120, XK140, Mark I, Mark VII and Mark VIII, MG TD, MG TF, MGA 1500 and MG Magnette toolkits.
It is the rare early cream tin, not reproduced and extremely hard to find in this condition.
We have a handful of these tins, but once they are gone, we may never find another in this condition.