So I continued to weigh the inside door handles till the box was empty. Then I separated left's and right's just to make sure what I found wasn't a side to side thing. My next picture shows the lightest handle on the scale at 3.2 ounces! After a while I could tell the light ones from the heavy ones just by holding them!
So I started looking at them and the lighter ones were different!!
They had the same part number but a different supplier number?
These handles came off 1968 1969 and 1970 B Bodies that I parted out over the years. So I don't know if it was a year thing, second supplier thing or model thing? My last picture shows the back sides with the numbers. So in addition to finding out the weight difference I found out there were two different kinds in the box.
So I will be swapping out my heavy 3.8 or 3.9's for 3.2's and save 1.3 ounces for FREE! I already have some other boxes of parts lined up for the scale!