A paperback copy of a Korean War era 1950 Dated US Bureau of Ordinance Publication "Periscopes Mark 27 Mods 0 and 1 Manual." In good condition. A 1950 Bureau of Ordnance (BuOrd) Publication for Periscopes Mark 27 Mods 0 and 1 is a classified U.S. Navy technical manual. It outlines the operation, maintenance, and repair of specific telescopic optical instruments used primarily for surface ship gunnery and anti-aircraft fire control. BuOrd was the U.S. Navy command responsible for the design, procurement, and maintenance of ordnance, munitions, and fire control systems until 1959. Bidders are welcome to preview items in person during our normal operating hours Tuesday through Saturday 11am-6pm. Estimated shipping parcel size (LxWxH) 14 inches x 12 inches x 4 inches. Please note, shipping estimates are provided for LiveShipping calculations only and may vary based on weight and location. The auction house will combine multiple lots to reduce shipping cost. Please inform the auction house prior to paying your invoice for special shipping requests. Our primary method of shipping is via UPS Ground.