Hi, I'm hoping for further information on this shell case which I have had for a number of years, it's stamped Rh.MF. 46, MAI (May) 1917 DUSSEL(dorf)? near the rim at approx 8 o'clock, a number 10 is stamped, and in the 6 o'clock position is SP61. The diameter of the base is 236mm and the height is 230mm, a mate of mine in the GWS says it might have been cut down.