Material : Brass, Glass Size - Approx 3"(approx) Beautiful brass military compass. This compass is accurate and perfect working condition. Military brass compass solid brass engineering lensatic prismatic compass easily folds and the lid opens and the front prismatic sight folds over the compass to function as the front sight. The prism has a magnifier to allow viewing the compass card and the object being sighted simultaneously. The height of the front prismatic sight can be adjusted to focus the compass.