"Bulova Quality" marking
Everything is copied verbatum from the record.
It appears Bulova switch to the “Bulova Quality” marking instead of the Karat marking on the watch cases because they reduced the gold content in the cases and did not want to advertise the reduction.
June 14, 1930 Congressional Record – House 10835
Bulova “Lone Eagle” watch not 14-Karat white gold filled