Ludwig Drum Guide - Serial Number Based Dating and Authentication Guides for Vintage Drums
How To Date 1960s Ludwig Drums By Serial Numbers — Not So Modern Drummer
1964-67 Ludwig drumset 20"-12"-16", Sky Blue Pearl, 3-ply
Modern Ludwig serial numbers | [DFO] Drum Forum
Ludwig Octaplus 1978 Black Vistalite Melodic Toms 11 PC Drum Set - Blue/Olive Badge Vintage/ USA | Drums, percussion, ludwig, gretsch, slingerland, camco, rogers,