(I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. cuff links: none. 1-1/2" or 37.5mm). collar bar: none. I always try to point out any clear blemishes and condition. 0.25" = 1/4" or 6mm - pretty small for standard button holes.
This product would be a great fit for fans of the San Francisco Giants, the 2012 World Series Champions.