I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. tie tack/bar: 2.14" x 0.31" (approx. 2-1/8" x 5/16" or 54mm x 7.5mm). collar bar: none. 0.25" = 1/4" or 6mm - pretty small for standard button holes.
Vintage Tie Bar Tie Clasp Gold Tone Dramatic Colorful Foil in Domed Black Bar
2-1/4" Thin Design Black Bar & Gold Tone Vintage Tie Bar Clip
VINTAGE TIE BAR CLIP CLASP STAY MCM Curved Modern Square on Textured Bar
VINTAGE TIE BAR CLIP CLASP STAY Thin Gold Tone Bar w/ mounted Orange Cabochon
Vintage 1-5/8" Gold Tone & Black Multi Texture Design Vintage Tie Bar Clip
1958 UK England Halfpenny Coin Money Vintage SMALL Vintage Tie Bar Clip euro