The repro T-3s (low beam only for 4-lamp systems) have a different baffle in front of the filaments. It's the common one in use today and is completely different from the original 56-60 (IMO) "half moon" and the 61-70 (IMO) "circle with slot'. I don't even look for "DOT"; it's easier to spot the baffles. Look at some originals and compare. You'll see what I mean.