Its known as a "collection" number....

Old collection number inked in obverse field..... see picture below. I have seen other Darkside coins with these numbers on them.
Does anyone know the origin of this practice?
Does anyone know if PCGS will slab and grade coins like this?
Thanks
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I believe I have seen NGC...Not sure about PCGS.
I've seen at least one piece that had numbers/letters inked by hand onto it that was then certified by PCGS in a problem-free holder.
In honor of the memory of Cpl. Michael E. Thompson
I would think that this gets decided on a case by case basis, and that there is no fixed policy.
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
See this link:
http://www.pcgs.com/images/articles/1922-1-3200-J-2020-PCGS-MS65_b.jpg
I've seen both NGC & PCGS straight grade Large Cents, Colonials, & Tokens as such.