The only thing known to me is the fact that there is at least one picture of a Do24MS, so it did exist. The MS extensions stands for Minensuche (mine search), and the plane was equipped with a large ring around the fuselage. This ring was attached to powerful batteries and when turned on gave the magnetic mines the idea that there was a ship passing by above it and so the mine would explode. All this of course happened without causing any damage to the Do24MS. Although aircraft fitted with a magnetic ring usually got the designator MS, there is no evidence that this was the case with the Do24, the sole(?) Do24 with this magnetic ring was most likely still designated as Do24T. The only known picture shows a Do24 from Seenotstaffel 5, which was based at Stavanger in Norway and the picture was probably taken just after the war ended.