For those unfamiliar with Luftwaffe nomenclature MSGr 1 was 'Minensuchgruppe 1' (mine search group 1) whose job was to remove mines from the sea lanes. It was formed in October 1942 from 'Sonderkommando Ju 52 (MS) which itself had been formed in September 1940 for the same purpose.
The aircraft had a large electromagnetic coil fitted (magnetspule) and would fly at an altitude of 30m above the sea, at which height the magnetic field generated would detonate mines. The aircraft were known as 'Mausi' after the initials of the sub-type/coil, MS.
Both units had emblems in various forms of eagles plucking a mine from the sea, but unfortunately for any modellers I've never seen them done in decals!
If the caption is correct, then that can't be Marseille as he was dead, just, by the time MSGr 1 was formed. Of course it could be an aircraft from the earlier unit prior to October 1942 with a bad caption.
Cheers
Steve