locked K-4 Decals


George Courtney
 

On K-4;s decals for the black Southern twin hopper is the following:  Sn 3 58.  Anyone know what this represents?.  I'm sure it's something for March of 1958 but not sure if Sn is a shop abbreviation and is it for a repair, update or repaint?

Thanks,
George Courtney

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