NOS Vintage CRL (aka Centralab / Central Radio Laboratories) Ceramic doorknob capacitor 5kV 12pF
NSN 5910-00-615-0036
New, old stock, military surplus, sealed in individual foil lined pouches. Most seem to be dated 1968, but I spotted a couple of 1965, so if year is important to you please message me.
The NSN number cross refers to this information, however treat this as guidance, I have no way of knowing that the exact same specs applied when these were manufactured.
Source: https://www.parttarget.com/5910-00-615-0036_5910006150036_DCC510NP120J.html