In the late 19th and early 20th centuries, American watches in the medium to higher grades from most manufacturers were often elaborately decorated with damascene engraving and texturing. Nowadays, computerized machines often do that kind of work. But back in the day, mechanical devices called “rose engines” were used. These machines were set up by very skilled operators, and it was amazing the work they accomplished, largely by automation. There were several Hamiltons shown in this thread that show that sort of damascene ornamentation. The Hamilton 952 you are referring to was likely made in the 1920s, by which time, the ornamentation was much less elaborate. To answer your question about what that texture is called? I’ll join you in waiting for someone to name it for us.