This dates back to early 60's. I find it listed in Stoeger's Shooters Bible from that era, but the contents are not given.
It is a soft black substance and still goes through the Lyman 45 with coaxing from a hairdryer, though I don't yet know if it will be effective.
Attachment 208709
Does any know the contents? Was it an effective lube in its day, when fresh? Thanks