This is the 400T. It had the alloy swing arm, the side number plates behind the shocks and the one piece tool kit beside the headlight. There were also some other little features like the tommy bar handles on the axles. I don't believe the T would appear in the VIN as T was a model designation and the VIN will have a year of manufacturer code embedded. There are plenty of sources on the web that will allow you to decode the VIN.
From memory the T was the first model of the 400. The PE range started with the 250B then when they went to C models a 175 was added then when the T model came the 400 was added.