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I have what I believe is a German WW1 shell casing. It is marked RhMF (54?) MARZ 1918 Düsseldorf. Approximately 8 1/2” diameter, 9 1/8” tall, 12 1/2 pounds.

Any information would be much appreciated.

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    Adding a photo might make identification a bit easier.
    – Steve Bird
    Commented Oct 17, 2023 at 20:45
  • "RhMF" would be the manufacturer Rheinmetall (originally: Rheinische Metallwaren- und Maschinenfabrik) located in Düsseldorf.
    – njuffa
    Commented Oct 18, 2023 at 10:12
  • The caliber of 8.5" as stated in the question equates to about 215 mm. The only land-based artillery I can think of that is close would be various models of 21cm Mörser, such as the 21cm Mörser 16. Maybe it's from a shell for a naval gun (I do not known anything about those)?
    – njuffa
    Commented Oct 18, 2023 at 10:20
  • I think the Mörser idea is a good one. Rheinmetall (RhMF) made a test canon, together with Krupp in 1906. However, the successful one of the two was Krupp, not RhMF, so I'm confused why they would have made ammunition for this one as late as March 1918 (especially since they stopped really using the normal Mörsers in Oktober 1918). Maybe the 54 number could help? Commented Nov 2, 2023 at 8:50

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