For old guitars we can only know the exact data reading the ESP warranty card (when there is), or unscrewing the neck (if the neck is bolt on) and read.
Many records have been lost during years and most of all were destroyed in a fire accident on late '90s in ESP Japan factory. An early California instrument can be identified by square slot-ends in the headstock, coverplate screws in the points of numbers on a clock, and the lack of a dot at the 17th fret. Later in the ’30s Regal in Chicago confused things by numbering a run of Dobros across the same range.
Dobro started its serial numbers around 800. Make Offer - Regal Resonator Guitar RD-40V (Vintage Sunburst) Regal RD-40 Square Neck Resonator Guitar MIK.
