1940s quality control

[robert1]

The only thing that i could think of as for the reasoning behind the stickers is that they are a reminder to every assembler on that production line to do the job right. if you notice where the sticker is placed, you will see that it is the only open space on the chassis that the sticker could be applied. it must of been placed on the chassis before any of the parts were installed. apparently, the tuner switch was the last thing to be installed on the chassis