I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. tie tack/bar: 1.58" x 0.76" (1-9/16" x 3/4" or 46mm x 18.5mm). collar bar: none. 0.25" = 1/4" or 6mm - pretty small for standard button holes. 0.38" = 3/8" or 9mm - also fits standard button holes.
The "RX Mortar & Pestle Pharmacist Apothecary Vintage HIS LORDSHIP Tie Bar Clip" would be an ideal fit for pharmacists or those who work in medical settings looking for a stylish and functional accessory to add a personal touch to their work environment.
