What's with the gap in vintage Ludwig set serial numbers? I'm selling my dad's old set and theres a gap in serial numbers between 1964 and 1965, this Ruby sparkle set happens
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![Can you guys help decode Ludwig serial numbers? | [DFO] Drum Forum](https://www.drumforum.org/media/img_0681.8479/full?d=1544331376 "Can you guys help decode Ludwig serial numbers? | [DFO] Drum Forum")