And it is more like 1975
'77 or 78 would have been way too late. There were logos patched on the bags in the earlier days too. I have several ranging from 1973-1976 that are like that. Not to mention since it is a 1410, that was still early in the 1400series. The model numbers were pretty much numerical. Maybe if he would post pics of the brush roll end caps, then that would be a deffent age marker. The very early 1st of the plastic based machines still had the square end caped brush roller. Then in 1976 they finally changed to the hex end, end caps.