OK - now that i have my chrono pusher situation sorted out (back in business), I mounted the RIOS1931 Pilot Strap I received from Germany last week. I was intrigued by this strap for a number of reasons - first, according to what I have read, it is based on a mid-century design for pilot straps that I had never come across; second, it is unique and i really like the "hidden" tang buckle. When I first saw it in the website pictures I could not quite visualize how it worked since there no pictures of the strap mounted. Now that it is on, I love it. Because of the design, it looks a bit like a BP strap without the deployant clasp but it is quite a bit beefier (which I like). The metal ring/keeper adds a little extra character as well. I did not start out looking for a strap with rivets but so far it is great. Btw - I got the 22mm version and squeezed it in to the 21mm lug space. It works just fine.
On another note, for those of you that got the 3777 with the SS bracelet, until you remove it, you will have no idea how much of the weight of the 3777 is the result of the bracelet. It is a whole different feel on a leather strap. My bracelet is sitting in oil for later at this moment but I think I will keep the strap on for quite a while. Very comfortable.