I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. cuff links: none. collar bar: none. tie tack/bar: 1.02" x 0.54" (approx. 1" x 9/16" or 26mm x 13.5m m). 0.25" = 1/4" or 6mm - pretty small for standard button holes.
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US Navy Female Enlisted/NCO Silver Filled Vintage Lapel Pin (no screw) i91
QA Shield Vintage Lapel Pin/Tie Tack sorority fraternity pledge p42
Beta Sigma Phi Vintage Lapel Pin Tack sorority fraternity pledge seed pearl p35
HDS Class of '47 Vintage Lapel Pin 1947 p22
Saint Louis Missouri Municipal Auditorium Vintage Lapel Pin m111