I assume that it means it was hand soldered (point to point) instead of PCB.
I think it’s more to be period correct and probably doesn’t affect the sound but I could be wrong.
The early StingRays did use a small PCB potted in black epoxy but other components (eg. output jack, Volume and Tone control etc) were not included om the PCB (outboard components). Today a lot of these components are included on the PCB. The wiring on the Retro Basses is how the wiring was back then