Answer from Dave McLaren which he posted on G&L's facebook page:
Tobacco Sunburst on Alder body:OSTSB has a light edge, still transparent. TSB has a dark brown edge, where we mist the edge lightly in black.
OSTSB is "old school" because that's how we used to do TSB in the '80s to early '90s
Old School Tobacco Sunburst on Alder body: