- 20mm Oerlikon 'S' [20X110RB] and 20mm Hispano [20X110] rounds were manufactured in England during WW2. Unfortunately I don't have in my collection a British made 20mm Hispano [20X110] fired shell case, I only have a 20mm Oerlikon 'S' [20X110RB] headstamped "1942. RG OeZ" => I have a list of the British headstamp maker's mark for the 20mm Oerlikon 'S' [20X110RB] and 20mm Hispano [20X110] rounds and the companies that manufactured these 20mm shell cases. I would like to know if my list is complete and correct; if it isn't, please post below the corrections or what is missing. There is my list: ---> "RG" or /|\ a "single broad arrow" (Royal Ordnance Factory, Radway Green); ---> "ST" (Royal Ordnance Factory, Steeton & Thorpe Arch RH); ---> "RC" or "RCC" (Raleigh Cycle Co.); ---> "K" (Imperial Chemical Industries Ltd. / ICI, Birmingham); ---> "K2" and "K3" (ICI Kynoch); ---> "BPF" (Unknown, 20mm Oerlikon 'S' only); ---> "WB" (Wilmot-Breeden, Birmingham, 20mm Oerlikon 'S' only); ---> "BBC" (Barking Brassware Co., 20mm Hispano only); ---> "BMARC(o)" (British Manufacturing & Research Co., 20mm Hispano only); ---> "GB" (Greenwood & Batley Ltd., 20mm Hispano only); ---> "H" (Hall's Telephone Co. Ltd., 20mm Hispano only); ---> "P & S" (Platers & Stampers Ltd., 20mm Hispano only); ---> "RH" ? (Raleigh Cycle Co., ?); ---> "JES" (After 1945, drill / inspection rounds ?). => Thanks in advance for any help, Orita 07/11/09