Rarely, but I have. I was sat with my wife in a beer garden in Bath this summer, and the old fella was wearing a vintage Sub, so I asked him about it, and we had a nice chat. He bought it from the NAAFI some time around 1970 - it cost him three month's salary. It was a service dial, I think, with white gold surrounds. We had a nice chat. But then we had both been drinking.
But no, not very often.