I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. cuff links: none. tie tack/bar: 1.57" x 0.36" (approx. 1-9/16" x 3/8" or 57 mm x 9mm). collar bar: none. 0.25" = 1/4" or 6mm - pretty small for standard button holes.
Choir Harp Music Vintage Lapel Pin z05
Harp Music Choir Vintage Lapel Pin x109
French Horn Music Instrument Vintage Lapel Pin f13
Choir Harp Music Instrument Vintage Lapel Pin f17
US Navy Female Enlisted/NCO Silver Filled Vintage Lapel Pin (no screw) i91
QA Shield Vintage Lapel Pin/Tie Tack sorority fraternity pledge p42