{"product_id":"original-u-s-wwii-era-m4-collimator-sight-as-used-on-60mm-and-81mm-mortar-systems-serial-126856","title":"Original U.S. WWII Era M4 Collimator Sight - As Used on 60mm and 81mm Mortar Systems - Serial 126856","description":"\u003cp\u003eOriginal Item: Only One Available. This is a very good original U.S. \u003cb\u003eM4 mortar sight\u003c\/b\u003e, a compact collimator sight used with the standard American 60mm and 81mm mortar systems during WWII. The sight remains in very good overall condition with its bubble level intact and is marked \u003cb\u003eSIGHT, M4 \/ STOCK NO. 7579927 \/ SERIAL NO. 126856\u003c\/b\u003e. No carrying case is included with this example.\u003c\/p\u003e\n\u003cp\u003eThe M4 was already standardized by 1941 for use with the \u003cb\u003e60mm M2 mortar and 81mm M1 mortar\u003c\/b\u003e. Period War Department technical literature describes it as a combination collimator and open sight incorporating elevation and deflection adjustments, allowing mortar crews to lay the weapon accurately for both indirect and direct fire.\u003c\/p\u003e\n\u003cp\u003eThis sight is in very good condition with an intact bubble level. There is no included carrying case with this example. The body is marked:\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cb\u003eSIGHT, M4\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSTOCK NO. 7579927\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSERIAL NO. 126856\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eFrom online sources we can find, this serial number should date the sight to the end of the war, or late 1945. This is truly a remarkable piece, and would make a great addition to any WWII mortar collection.\u003c\/p\u003e\n\u003cp\u003eThis is a strong representative example of an original \u003cb\u003eWWII-era M4 mortar sight\u003c\/b\u003e, retaining its clearly marked stock number, serial number \u003cb\u003e126856\u003c\/b\u003e, intact bubble level, and principal optical components. It would pair particularly well with an original or display M2 60mm or M1 81mm mortar setup.\u003c\/p\u003e","brand":"Original Items","offers":[{"title":"Default Title","offer_id":45888388005957,"sku":"ONSV26CNB170","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1524\/1342\/files\/F393F5C4-FBDE-415A-8FC9-ADEF4F8C8ECE.jpg?v=1790630426","url":"https:\/\/www.ima-usa.com\/products\/original-u-s-wwii-era-m4-collimator-sight-as-used-on-60mm-and-81mm-mortar-systems-serial-126856","provider":"International Military Antiques","version":"1.0","type":"link"}