[78-L] His Master's Voice labels - small number?

[David Palmquist]

See 
http://ellingtonweb.ca/Hostedpages/DoojiCollection/DE3312a-RudeInterludeSept26,1933.jpg

HMV labels often have their catalogue numbers such as B.6449 as well 
as another small number like 40-6067.  This is not the matrix 
number.  Can anyone tell me what it signified, please?

David in Delta

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