[78-L] Early Columbia matrix

[Han Enderman]

Ebay 380510251500
shows following record:

Columbia A-107 Columbia Band: The Forge In The Forest.
Matrix on Note the Notes label is 479, but wax gives 130. 
Is 130 a mx or an earlier catalog nr?
Also in wax 4-3-3, which must be take + stamper. 
When did Columbia start to use letters to identify stampers (A1 etc)?

The reverse, Marching Through Georgia, gives mx 46890 on the label. 
A slightly later image of this label (Grafonola label, with printing date CY = Mar 1918) 
has this nr in the wax.
But an early pressing with the large Magic Notes label has 507 on the label.

han enderman