The Triple Lock was the first Model. The quickest way to tell at a glance that it is not a Triple Lock, is that the first model had a shrouded ejector rod.
That one has a naked ejector rod, so it cannot be a first model.
To see if it IS one, you can look at the right side, at the front of the frame, where the bottom of the barrel shroud is touching the frame.
In this picture it's an easy thing to see because it's not blue, while the rest of the gun is. You may have to blow the picture up, depending on your screen size. But that little "not blue" part is the third lock.