Original U.S. WWII Era M4 Collimator Sight with Two Carry Cases - As Used on 60mm and 81mm Mortar Systems
In stock
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Original Item: Only One Available. This is a fantastic example of an M4 Collimator sight. This sight was used on both the US 60mm and 81mm mortar systems. By laying the sight on aiming stakes, the mortar squad could fire indirect missions. The open sight allowed the squad to fire direct lay missions. 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 sight is a closed tube with a lens at its open end and a luminous reticle mounted near the closed end at the focus of the lens, creating an optical collimator. The reticle is illuminated by an electronic light source (an incandescent light bulb or, more recently, a light-emitting diode) or by ambient light gathered behind the reticle via an opalescent window or fiber optic light pipe. Collimator sights are a relatively old idea, being used in many forms for almost 100 years.
This sight is in very good condition with an intact bubble level. This example comes with two great carrying cases, one of which retains the carrying strap and is marked:
D29377
CASE, CARRYING
M14
The closure snap for this example is broken off of the case but still looks okay for display if it is pushed back in. This example is marked for manufacture by Graton & Knight of Massachusetts.
The second carry case is the smaller black leather model which is in better shape with no carry strap. It is marked on the front with the same information as the previous one.
Information on the sight itself:
SIGHT, M4
SERIAL NO. 137841
This is truly a remarkable piece, and would make a great addition to any WWII mortar collection. Ready to display!
- This product is available for international shipping.
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