To answer your question: There is no answer. I have seen the Pulsations bezel on watches from the late 60s and early 70s. But I wouldn't doubt these bezels were available in the early 80s, while I personally believe that no watch left the factory with such a bezel. They were replaced by the jeweller who sold the watch or they were mounted later on.
Your bezel is a later service part. I cant't tell exactly when the redesign of the Pulsations bezel came out, but I think this was later than the early 1980s.
Click to expand...