This letterbox cache is NOT at the posted coordinates.
The stamp is part of the cache, and NOT a trade item.
Bring your own pen/pencil.
Near the posted coordinates you will see a sign on a gate post. From information on that sign, multiply the number of double bogies you can see on one vehicle by the number of wheels on the other vehicle. Take that result and starting next to the sign post, count posts.
Please leave the cache as you found it for the enjoyment of the next cacher.
Parking is is marked, but it is at the end of an eroded road, so caution should be used. You may choose to walk in from a distance.