Braewood is the company / trademarked name for the fake veneer.
It's on the 4408's I just refinished but not the 4401's that are just a little older.
It's a different shade when oiled or poly'ed and really looks different than the classic veneers of old.
Really don't know if there was a cutoff date for the change since the consumer and pro divisions had their own agenda and price/target points.
and IF there was any lead in the linseed oil you would have to INGEST it or inhale the powdered dust after it dried to get into your system. both are pretty unlikely so the real danger here is the single cigarette you smoked near the open can..
BTW when sanding the real walnut veneers be sure to use a air nozzle to blow out all the fine dust in the grain before applying anything.. Makes the WORLD of difference in the depth / texture when properly oiled and/or coated.
sub