This is an antique military button cleaning guard stick. The brass guard tool slides underneath the button attached to the uniform to protect the fabric from being ruined whilst cleaning or polishing the button.
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VINTAGE MILITARY BRASS Button/Buckle Cleaning Polisher Protector
Brass Button Stick - Canada
WORLD WAR I Brass Button Stick Smith & Wright £5.50 - PicClick UK
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Button Stick (1917?)
BRITISH ARMY WW1 WW2 BRASS BUTTON CLEANING STICK
BRASS BUTTON STICK. War Department Dated 1955 Numbered 936. JR.G&S £1.51 - PicClick UK
Vintage Military Brass Button Stick, Broad Arrow Marked Button