Of all the Seiko PROSPEX pieces, this is probably the first one to be fitted with a leather strap out of the box. It basically deviates from the standard strap choices of either stainless steel bracelet or the iconic rubber straps from the PROSPEX divers. It’s an odd choice for a tool-watch but nonetheless the leather strap offers a sporty feel to the entire piece. It may be so that the leather strap will not be pleasing to some folks, and it somehow is a hit or miss for PROSPEX collectors. Most folks I know who own one are either changing the straps to be worn with a steel bracelet, or a nylon strap, and of all straps I saw the “Field Tuna” was use with, the Bremont canvass strap fitted below is by far my favorite.