The 125 was the odd man out for about 6 months.
There are two 74 DT125s - one type is a mildly rehashed AT2 with a light green tank, the other is a 125 version of the blue DT175 that I posted a pic of, with a bronze/metallic burgundy tank. I guess they had a big pile of left-over AT2s to sell off...
The early type seems to be quite a rare bike - I reckon I come across ten times as much brown-tank stuff as green-tank stuff.