I have a 14x10" 6 ply Ludwig shell with a lacquered inner ply.

It's just a shell (no hardware) and the covering has been removed.

The only way I hope to narrow down the date of manufacture is by the internal tone control holes. The holes are for a 1" knob and they're directly above the vent hole (where the badge would be)

My question is:

During which years did Ludwig place the tone control above the badge?

Thanks!Coffee Break2