I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. tie tack/bar: 1.66" x 0.91" (approx. 1-11/16" x 7/8" or 42mm x 23mm). collar bar: none. 0.25" = 1/4" or 6mm - pretty small for standard button holes.
This product would be a great fit for US Navy officers, aiming to showcase their support for the Armed Forces with a fun and stylish accessory.