1944 BRASS CLINO MORTAR SIGHT MK-4 NO. 15878. Condition is "Used". Shipped with USPS. Here is a fascinating I understand salesman sample, definitely a World War ii, WWI era dated 1944 clino mortar - MK4 number 15878 site. This beautiful brass dated 1944 Clino mortar MK4 number 15878 site has an adjustable sight on a semi elliptical track, with Target engraved in the sides, and the number 0.S.508A engraved on one side. This fascinating military bomb site or motor site, is an excellent original condition, likely unused, but more likely a salesman sample, or military display for military brass hardware in the United States military in wwii, World War II era. Please review photos. This display came from the estate of an avid Sparta, Missouri, advertising and salesman sample collector. Please review photos. This beautiful vintage cleaner mortar mk4, number 15878 dated 1944 mortar or bomb site brass heavy material item, we'll make a traffic addition to your 1940s World War ii, WWI era military hardware salesman sample or military display item memorabilia collection.