Hard to find, a Spanish M1965 Airborne helmet. These were used by Spanish forces from the 1960s until the 1990s. This particular one has a Spanish designed leather suspension system that was only used for a few years. The helmets don't have a rim on them, and retain a raw edge, which is how you can easily identify these rare birds.
The Airborne variants of these helmets are extremely hard to come by, and are a must-have for any serious helmet collector. Sweatband has seen better days as pictured, but it's still a very solid example of a really rare helmet. Actual helmet is pictured.