特別拝謁記念 - Special Audience Commemorative /拝謁 - Haietsu, having an audience with someone of very high social standing (e.g. the emperor)/
Marked with "K18" for 750th gold and Ikoma workshop mark https://asiamedals.info/threads/badges-marks-and-history-of-ikoma-workshop.20961/
Original case.
特別拝謁記念章 - Special Imperial Audience Commemorative Badge
生駒時計店謹製 - Made by Ikoma Watch Shop