Thanks for checking the headstamp.
Thanks for the update on the identification of manufacturer MP.
This doesn’t surprise me, in reference to the manufacturer NOEN identification given in the above post as “Navy Ordnance Engineering Laboratory”, 2 older manufacturing listings I have indicate NOEN to be Northern Engraving & Manufacturing Co. LA Crosse, WI. (producing the Mk2 cartridge case from 1942 to 1943 and the Mk 4 cartridge case from 1944 to 1945).
And from the thread: viewtopic.php?f=8&t=10339; Darling2 posted the following: “I have a paperweight, or what I believe is a paperweight, it is a wood block with a 20mm Oerlikon casing bolted to it, headstamp is NOEN 20 M.M. MK. 4 1945. There is an engraved plaque on the front that reads 100,000,000th Oerlikon Cartridge Case Made By Northern Engraving & Mfg. Co.”
But others indicate NOEN = Navy Ordnance Engineering Laboratory, Dahlgren, Md. For example see: bocn.co.uk/vbforum/threads/9 … ot-of-20mm.
So which is correct or did both produce 20mm Oerlikon cases during WW2?
PS- Doing a search on GOOGLE gives no results for “Navy Ordnance Engineering Laboratory, Dahlgren, Md”. The closes result is the Naval Ordnance Laboratory.
From the dreaded Wikipedia:
“In 1929 the Mine Laboratory was merged with the Experimental Ammunition Station in Indian Head to form the Naval Ordnance Laboratory.
NOL began slowly, and it was not until the beginnings of World War II, when Germany’s aircraft-laid magnetic mine began to cause serious problems for the Allies. As the importance of NOL’s work became apparent, it also became apparent that there wasn’t enough space at the Navy Yard to accommodate the necessary research facilities.
In 1944, acquisition, planning and construction work began at a 712-acre (2.88 km2) wooded site located at 10903 New Hampshire Avenue, Silver Spring, Maryland. Someone remarked to a Navy official during early 1945 that it seemed odd to be building the new laboratory at that time: the war would probably be over before the facility could be finished.”
Sounds more like a research facility than a production facility and so late in the war.