GB 1937 CORONATION on PHILATELIC CONGRESS COVER FOLKESTONE + LABEL FIRST DAY OPT

24th Philatelic Congress Folkestone cover with illustration of town + steam ship from 1848; KG6th Coronation 1 1/2d franking; Congress oval postmark dated 9 JU 1937; + Congress label overprinted “First Day" in red used as seal on the back.