[78-L] Columbia 1-A-6 etc

[Rodger J. Holtin]

I was explaining take numbers to a novice collector the other day and got stumped on those other characters on Columbias.  

In the instance above, the 1 is the take number but what are the letters?      Don't think I've ever heard those discussed. 

AND...

The 6, again from the example, relates to pressing data in some way. I know that very popular records display those as high numbers, indicating lots of records pressed. Most are single digits.  My copy of Duchin's Ol Man Mose is 21 and one of the Two Black Crows I have is in the 60s and another is way over 100. What exactly do those numbers represent??  Can we infer quantities pressed from those numbers??

-- 
Rodger
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Sent from my iPhone, which explainz any bad typjng and nonsensical word choices.