It's there. This was my dad's gun and I was sure it was a dash 2. But I just dug it out of the safe and the smooth area is present. If you look very closely at the pic, you actually can see it.That's a -2? The 'groove' behind the knurling on the ejector rod (LH thread) is hard to see.
Sorry about that, Jack. My question was for the OP.In that photo you can clearly see the "groove."
Jack