My wife and I used to work for Siemens VDO Automotive in Lima, Ohio and I realized that we helped make this part and the top also. Did not realize it until I took it off the car and it looked real familiar.
From this picture I can tell you that the number 3409-a means that it was made on the 340th day of 99 by shift A (1). The white dot is from the paintpen of the packing person verifying all the clips and j-nuts were on it and a filter was present.
I just thought it was cool and tyhought I would share this worthless info.