Harley Davidson vintage leather cap. Great style, missing leather closing strap.

Vintage leather Harley Davidson leather, chain studded cap. Studded brim w logo, made in USA. Very good condition with the exception of...a missing leather piece to adjust n buckle in the back! Still very wearable, but without the little leather piece to buckle it tighter. I can't find a size tag, let's call it S/M...I will reduce the price becuz of this. please review photos. Thx