Based on the type of paper and black ink used, this draft manuscript on the remainder term in the circle problem appears to date from the late 1940s or early 50s. The penultimate page, written in blue ink on a sheet of notebook paper, seems to be a supplemental sheet -- possibly consulted during a lecture. The final page is a fragment that appears to go with the pages in black ink.
The manuscript was found on a shelf close to Selberg's desk, except for page 10 and the fragment, which turned up in one of the desk drawers.