NOS (New Old Stock). The inner package is still sealed. The packaging is in remarkable shape for being stored this long.
Outer box states:
"IMPORTANT: Use With CS 21016-3 For Complete Overhaul."
There is a 1967 date on the box. The box states: " Jaguar XK 150, 1957-61". I don't know if this will be compatible with any other years or models (Do your own research). Sold as is.