Thanks for that. May I ask what "132 companies 332 production varieties" mean? (Just me being curious - or some say nosey.)
Judging from the northerly position of Lincoln's ear on the brockaged face, this is a counterbrockage/clashed cap strike. The die cap, which was striking counterbrockages, collided directly with the reverse die when a planchet failed to be fed into the striking chamber. The working face of the die cap picked up a fresh raised image that was incomplete. The cap then proceeded to strike a few more planchets, this being one of them. The result is a mixture of counterbrockage and brockage design elements. The brockage is a secondary brockage (secondary to formation of the die cap). This is the most common of the eight known or theorized types of brockage/counterbrockage errors.
I collect slabs and certificates from all the grading companies. The signature has not been updated in some time, At the time my book came out I knew of 82 companied and 230 production varieties of holder/slabs/certificates (production varieties are those that would be received on submitted coins. There are other types of slabs as well, Sample, Presentation, novelty, advertising, and of course there were also body bags) when the signature was last updated I knew of 132 companies and 332 Production varieties. Today I am over 155 companies and I don't know how many production varieties.