Looks like "dropped R" in Speedmaster font, so it would be from mid 80's
Dial and bezel match that period, and it would be 145.022 with cal 861 movement. Of course someone who actually knows what they are talking about may come in and completely refute everything I said, so dont take my word for it, it isnt worth much 😀
PS: I can only see one of 3 pics. 2 are not showing up