Air Cleaner ID
 

I was asked the other day if there were part numbers stamped into the 70-2 air cleaner assy I have. I couldn't find any, and to the best of my and several friend's memories, we can't remember ever seeing numbers or the pentagon stamped into an air cleaner, All we can remember is some yellow lettering on the side of the air cleaner or inside the lid for the part number. Anyone know for sure, and where they might be located if they exist? Thanks