海軍協會 - Navy League
大阪府支部 - Osaka Branch
Marked with Osaka Ikoma workshop mark https://asiamedals.info/threads/badges-marks-and-history-of-ikoma-workshop.20961/ and 純銀 - pure silver.
Original case.
生駒時計店 - Ikoma Watch Shop
大阪 - Osaka
japanesecufflinks
kaikōsha club
kaikōsha cufflinks
made for kaikosha
manufactured for kaikosha
officer's club kaikōsha
officer's club kaikōsha cufflinks
偕行社製
偕行社調製
Set of obidome and cufflinks.
Made by Ikoma workshop.
Another such set https://asiamedals.info/threads/badges-marks-and-history-of-ikoma-workshop.20961/