Original U.S. Cold War Navy 3 Inch .50 Cal Mark 29 Armor-Piercing Capped Round - Inert Headgear The plastic casing of the

The plastic casing of the mine is usually dark olive green

The right side of the barrel is marked with an Oberndorf antler proof

reading JSA / 1901

There are no signs of dry rot and the pea green color is nice and rich

Original U.S. Cold War Navy 3 Inch .50 Cal Mark 29 Armor-Piercing Capped Round - Inert Headgear The plastic casing of theOriginal Item. Only One Available. The 3 inch . 50 caliber gun (spoken "three inch fifty caliber") in United States naval gun terminology indicates the gun fired a projectile 3 inches (76mm) in diameter, and the barrel was 50 calibers long (barrel length is 3 in 50 = 150 in or 3. 8 m). Different guns (identified by Mark numbers) of this caliber were used by the U. S. Navy and U. S. Coast Guard from 1890 through the 1990s on a variety of combatant and