Pub. L. 86-682, tit. 39, pt. III, ch. 43, sec. 3314
Status on change in class of office
§ 3314. Status on change in class of office A postmaster appointed in the competitive civil service at a post office of— (1) the first, second, or third class whose post office is relegated to the fourth class; or (2) the fourth class whose post office is advanced to a higher class, shall continue to be the postmaster after the change in the class of office.