Original British WWII Royal British Navy Brass Collimating Gun Sight With Transit Chest By W. Ottway & Co - Dated 1945 MP 40 probably the world's first purpose-built

probably the world's first purpose-built combat aircraft

the insignia of the coat of arms of the United States

so look closely at the product images

It has the standard "vulcanfibre" peak / visor

Original British WWII Royal British Navy Brass Collimating Gun Sight With Transit Chest By W. Ottway & Co - Dated 1945 MP 40 probably the world's first purpose-builtOriginal Item: Only One Available. This is a lovely British Naval Collimator as used for Naval gun sighting purposes. A collimator sight is a type of optical sight that allows the user looking into it to see an illuminated aiming point aligned with the device the sight is attached to, regardless of eye position (with little parallax). They are also referred to as collimating sights or "occluded eye gunsight" (OEG). The basic layout of a collimator